I'm putting together a 505 with Indy EZ heads from Porter racing with a solid roller cam spec'd by Dwayne with a repo cross ram intake. My plan is to get a pair of Edlebrock 750's. My question is should I just buy 2 from Jegs?Or is there someplace or someone to set up a pair. I have never ran dual carbs or the edlebrocks. This is going in my 64 strip/street car looking for 10.50s. Thanks Mike

I'd go smaller than the 750's. Edelbrock sells the 500 cfm carb calibrated for dual carb applications so that is what I would use. That gives you a total of 1000 cfm which should work fine with the cross ram.

Mancini or Hughes can sell you the correct linkage kit which is designed for the Edelbrock carbs. Using the Edelbrock carbs saves you a ton of money over trying to find the factory correct parts.

Did you read this article?

http://www.moparts.org/Tech/Archive/bb/80inches.html

Yes i did. I have linkage already just need carbs yet. I'm not sure 500s would be enough Dwayne said 750s. Looking for 625 hp to get my 64 in the mid 10s

Dual 500 cfm carbs can easily support 625 hp. I'd use the smaller carbs for something that is going to be street driven. You can go with 750 or 800 cfm carbs if you want. The air valve secondary is pretty forgiving in terms of over carbing an engine.

64 Max wedges had 750's from factory. All the max wedges I do for big hp street or strip I use the 750"s You will need to jet them right out of the box because they are way to rich. leave the rods stock and use .104 jet in primary and .082 secondaries to start and get you in the ball park.

this!

Thanks for the info! The car will only see a couple hundred miles a year on the street.

If you buy the Edlbrock carbs. make sure and don't buy the smog ones with the electric chokes , buy the Hi Po versions with the manual chokes I've used both versions both on street hemi and M.W. motors, the non smog carbs. are way better out of the box I would use and follow the secondary jetting recommended in the old Mopar drag manuals

I was looking at the 1407s. I will google the drag manuals. Thanks

the '64 3705 carbs are identical in size to the 1407 and would make an excellent choice. the 1407's will be too rich and need a metering rod and jet change for base lining to factory specs. i believe this to be factory specs.

.104 jets for primaries, .066-.052 metering rods. secondary jets, .063 choke side, and .089 throttle side.

Thanks think I will try 1407s.

If they actually flowed 500cfm....Those eddy 500's only flow 350cfm or there abouts. I would run 750 or bigger manual eddy carbs with all the choke stuff removed.

Max Maniac has a couple of Eldelbrocks for sale, real good pricing

With an extra 80 cubes and 200+hp over a stock 426, I don't know that I'd drop the jetting all the way down to what came in a stock MW carb.
I'd rather err on the rich side to get it going.

I ran a 498 with two 750's on a Stage 1 cross ram with the the jetting called out in the old Mopar Performance tech sheets from 1990 to 2002. Even had to solder one jet closed and redrill, as I remember it was .068.
Doug

The cubes and HP should have nothing to do with the jetting, if anything the stock jetting might be too rich.

lewtot184 has the best suggestion, the stock 3705s flow about 700 CFM.

Huh.

The factory manual calls for extreme cross jetting but when I ran my MW setup I used Edelbrock carbs right of the box and they were close enough. By close I mean the plugs looked okay, the EGT's were fairly even and the widebands were okay. Not sure what the factory guys were looking at when they cam up with their recommendations but with a 500 inch shortblock sucking on that cork of an intake I wouldn't start with their old info.

I ran dual 800 Eddy carbs on that first engine but later on I switched the engine over to dual 500 cfm Edelbrock carbs and made roughly the same amount of power. Which is why I wouldn't have any issue starting off with 500 or 600 cfm carbs. They have plenty of airflow to support 600 hp from what I've seen on the dyno.