Does the four digit date code on your 4749 correspond close to the SPD of your 70 Coronet? I bet not, I think the 4749 was issued in 72 and the dates on any of them would be later than 1970 production cars. I believe the 4749 is a kind of generic replacement carb for the 70 4bbl Holley carbs.

I'm not sure the search is over for two reasons.

First, a confirmed late build that is different than all the "bad" parts books may or may not be accurate for the preceeding months, although in a vacuum I would agree it is better than nothing.

Second, no one has yet answered the question about the physical difference(s) between N96 carbs and their equivalent non-N96 counterparts (regardless of engine).

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Why do you think there should be a different carb. made for a 70 440+4 non N96 car and one with N96?? There were none made for 70 340 cars, N96 or not, same goes for 71 340 TQ equipped cars, nothing special made for a car with or without N96. In fact it looks like Carter carbs did not cater to the N96 code. Only Holly issued different carbs for that option.
As far as differences go, check column 38 for the 70 Holley 383+4 4367 manual non N96 parts listings, and check the 68 column for the 70 383+4 manual N96 parts listings. There ARE differences between the two.

I don't know if this will help but my bee is a 383 Auto N96 car (# matching motor 47,000 original miles) and I have the original Carb (Holley R4368) which is not on the car currently (I have another Holley R4368 on the car now because the squirter threads on the original were stripped.) and I'll try and get some pics for you all later tonight if your interested.

I also several years ago rebuilt a Holley R4367 for a friend that was on a 1970 383 4spd roadrunner non air grabber interestingly enough (this was original to the car as well that had 39,000 miles).

Also the secondary throttle bores are in fact slightly larger than the primaries on both of these carbs. Both of these carbs can be pricey when they come up for sale or on E-bag. Expect to pay at least $250 for a good core.

Top shot showing the larger secondaries..

Passenger side showing the "divorced" style choke hookup.

List number

Last shot showing the numbers matching R4368 with the correct primary bowl setup.

BTW the R4367 Holley (1970 383 4spd ) is nearly identical to this one.

If you refer to the 1970 factory Service manual, there are speciations for a total of 5 Holley 4160 series carburetors for the 383. With the exception of one fast idle speed spec. all other listed specs are identical including the diameter of the throttle bores and venturies. No mention of Fresh Air, F/air, Air Grabber, or N96. Of the three open bowl vent carbs (C.A.S. or 49 state versions) there is one for the manual trans (R-4367A) and two automatic trans versions with and without AIR conditioning (R-4369A and R-4368A). AIR conditioning-Fresh AIR, what if the some of the 70’ parts tables from the day reflect a simple type error? I owned a 70 RR 383 4-speed N96 car with it's oringinal R-4367A Holley back in the day and spent a great deal of time deciphering Holley carb numbers, came to the conclusion back then that some of the parts information published at that time was wrong in reguards to "w F/Air" and that there never was a N96 carb. It amazes me that people are still talking about this 39+ years later.

Whats the going rate for a 4749 carb, do they pop up on e-bag?

ademon: Just sent you an auction for a 4749. Good luck!

All those pictures of the 4368 would indicate that a basic 383+4 automatic carb. was "substituted" for the required N96 carb. on several occasions. Do you have a broadcast sheet for your car showing what carb. was called for when the car was built? The plot thickens!

Here's my broadcast sheet finally. Any further thoughts?

Here's the number on the one I have here, it is smudged but List# definately reads 4737

1970

383 manual - E & B-body - with ECS (N95)
orange HP engine 335hp
---------- Holley R4217-A ---------- part number 3418 537 on b'cast 37
383 manual - E & B-body - w/o ECS
orange HP engine 335hp engine on b'cast 084 with A/C & 087 w/o A/C
---------- Holley R4367-A ---------- part number 3418 536 on b'cast 36
383 manual - E & B-body - w/o ECS & with "fresh air" (N96).
orange HP engine 335hp
---------- Holley R4736-1A ---------- part number 3512 964 on b'cast 64
383 manual - E & B-body - with ECS (N95) & with "fresh air" (N96).
orange HP engine 335hp
---------- Holley R4738-1A ---------- part number 3512 974 on b'cast 74

383 automatic - E, C & B-body - w/o A/C & w/o ECS
blue engine 330hp
---------- Carter 4736S ---------- part number 3418 538 on b'cast 38
383 automatic - E, C & B-body - with A/C (H51) & w/o ECS
blue engine 330hp
---------- Carter 4732S ---------- part number 3418 540 on b'cast 40
383 automatic - E, C & B-body - with ECS (N95)
blue engine 330hp
---------- Carter 4734S ---------- part number 3418 541 on b'cast 41

383 automatic - E & B-body - w/o A/C & w/o ECS
orange HP engine 335hp engine on b'cast 088
---------- Holley R4368-A ---------- part number 3418 542 on b'cast 42
383 automatic - E & B-body - w/o A/C & with "fresh air" (N96).
orange HP engine 335hp engine on b'cast 088
---------- Holley R4737-1A ---------- part number 3512 965 on b'cast 65
383 automatic - E & B-body - with ECS (N95)
orange HP engine 335hp
---------- Holley R4218-A ---------- part number 3418 543 on b'cast 43
383 automatic - E & B-body - with A/C (H51) & w/o ECS
orange HP engine 335hp engine on b'cast 089
---------- Holley R4369-A ---------- part number 3418 562 on b'cast 62
383 automatic - E & B-body - with ECS (N95) & with "fresh air" (N96).
orange HP engine 335hp
---------- Holley R4739-1A ---------- part number 3512 975 on b'cast 75

1971

383 manual - E & B-body
orange HP engine
---------- Holley R4667A ---------- part number 3512 848 on b'cast 48
383 manual - E & B-body - with "fresh air" (N96).
orange HP engine
---------- Holley R4734A ---------- part number 3512 849 on b'cast 49

* some sources show the following manual trans carbs w/same part numbers

* 383 manual - E & B-body
* orange HP engine
* ---------- Holley R6191A ---------- part number 3512 848 on b'cast 48
* 383 manual - E & B-body - with "fresh air" (N96).
* orange HP engine
* ---------- Holley R6193A ---------- part number 3512 849 on b'cast 49

383 automatic - C-body
blue engine
---------- Carter 6125S ---------- part number 3512 844 on b'cast 44

383 automatic - E & B-body
orange HP engine
---------- Holley R4668A ---------- part number 3512 830 on b'cast 30
383 automatic - E & B-body - with "fresh air" (N96).
orange HP engine
---------- Holley R4735A ---------- part number 3512 842 on b'cast 42