Back in the early 70's I raced a 69 Barracuda with a 440 and a tunnel ram with 2 Holley 750 double pumpers. I still have the tunnel ram and at 75 years old I am trying to help my grandsons get going with their drag racing. My question is are the Holley double pumpers the way to go or is there a better choice out there with all the new technology in the last 40 years. This setup will go an a 440 .030 over with 915 heads 214 and 181 valves, Sig Erson 320 HLM solid lifter cam 250 @.050 108 LCA .570 lift, these are what I have left from my racing days. Your input would be much appreciated as I have been out of the loop for a very long time and would like my grandsons to have a positive experience, thankyou.

If what you had worked well before that is where I would start and update from there.

Also I think its really cool you are getting your grandsons involved in the sport.

You need to contact thumprdart or mark whitener and have them set those carbs up at a minimum. Those carbs are obsolete anyway. There are much better choices out there.

If you still have those carbs use them
If not look at buying a set designed for a tunnel ram

That’s a lot of carb for a 250@.050 cam in a 440.

hi,
I ran that setup in my Dart back in the late 80's with a .590 MP cam. ran great. if you can find the direct connection engine book it shows how to set the 750 carbs up with 440 tunnel ram
gary

While the 750's might be a little big for that, you have about the best carbs (if they're the ones from the 70's era) from a starting calibration standpoint as anything out of the box you could buy today. For the tunnel ram, you would probably need to lean the idle circuit a little and if you get into tuning with O2 sensors, maybe a little hsb tuning.

Plenty of initial ignition timing cures a lot of what you might think are carb problems too.

I would (and did) probably go to a little more duration on the cam with those heads. fast68plymouth could give you a little guidance there.

Thanks very much for your input, I have a feeling that I must have put the camshaft in a box that was for a chevy because when I look up 320HLM on the Sig Erson site that 320HLM is for a chevy motor. After 40 years I kind of forget a lot of the things I knew back then. But I was sure the cam I have had a 302 duration, but I do not know how to check it out as I live in a small town and there is no mopar engine builders here.What cam would you recommend for 2 750 Holley's? I do not have the original carbs that is why Iwant to know if there is a better carb setup today than there was 40 years ago, thanks for your input.

If you don't have the originals, you are FAR better off calling one of the two guys I mentioned above and let them help you. To me, a carb that is adjustable is just as important as a shock or anything else that is adjustable.

The metering blocks should be able to have emulsion changes easily, and the idle feed restriction should be adjustable as well (with a simple jet not a pice of bailing wire). Get a carb with bowls that have sight glasses in both sides. A billet base plate makes life easy. Also, the ability to buy nice air bleed blanks so you can drill them to size is nice. All modern main bodies I know of have the correct size bleeds. I'd look into the billet BLP main body and go from there.

The two guys I posted will make your life much easier if you let them

If you want to stay with carbs,Talk to Dom and get Thumped!! His carbs come with his liftime tech line

EFI has become competitive with many choices

I dream of EFI before I die

If I'm remembering correctly all the Holley 650,750 and 850 Double pumpers series carbs. all have the same size throttle blades and venturi boosters in both the primary and secondary sides so the mixture will be equal on both sides of the intake manifolds at WOT
I would call Quick Fuel, Pro Sytems, Thumper Carbs and any one else you would like to talk to for more information on size, price and when they can delivered the carbs to you
I haven't mess around with a lot of tunnel ram motors but every BB 440 Mopar motor I have swap to bigger carbs, heads, camshafts and exhaust system all went faster at the track, all of them
Same thing on a engine dyno tests, more air and fuel = more power

I had an iron headed, .60 over 440 with a 250 @ .50 solid cam. Two Race DemonTR 750's on a Mopar M1 and it ran real good. It was a boat engine. Went 10.70 in my Challenger way back when.

Got a pair of 660 centre squirters you could lend but Im in Australia
Good on you for get involved again and good luck with it all.

Pretty sure the 4779 750 is the only one of the 1-11/16 bladed double pumpers that had the same front and rear venturies. 850 also does but is 1-3/4 blade.

I ran a 440 tunnel ram with 2 660 center squirters, 590 purple cam in my Cuda with a stick. Ran high 10's consistent. I would check with Dominic Thumper and have him build you a set. A lot of guys are going billet bodies these days because of the lousy casting coming from overseas. If you have the extra money, it would be a real good choice.
Very low maintenance combo, lots of fun. Good luck with the project.

You would be correct. the 650's have different sized primary vs. secondary venturi's

And no modern main bodies that I know of come with even close to the correct size bleeds. most carb builders revert back to or very close to earlier bleed/emulsion combos in most cases.

What TR, and what's its plenum volume and runner length vs. what would be the choice today?

I have 2 1050 Dominators on my 528" Hemi with a Indy Tunnel ram. It took a little work on both of them but idle, cruise circuit & W.O.T. are all crisp and runs perfectly from idle to redline. A/F ratios were great on the dyno as well.

The engine sounds fairly mild. If you don't have carbs then you might be better off to sell the tunnel ram and just put a single plane intake on there. If you want to use the tunnel ram just for looks then buy a couple of small carbs. If it was me I'd use two 500 cfm Edelbrock carbs. They'll run just fine on a mild 440 with a small cam and they'll cost a lot less than a couple of double pumper Holley carbs.