what size double pumper would you guys suggest for a 400 small block putting out 375 fly hp and 440 fly torque?

i am going to upgrade the heads and cam and everything later, too...

but my main question is would a holley from any old muscle cars be a good one to use?

my dad owns an antique auto salvage and he has hundreds of carbs, including quite a few holleys...

do you think if i took one and rebuilt it, that it would be right for my engine? and does anyone know any cars in particular that had a good one to use?

thanks...

 

A 3310 750 cfm VS will probabily be the most common.

Holley's were factory installed on 60's Chevy small blocks and Big Blocks. Also on Ford Small Blocks and Big Blocks. CFM size ranged from 550cfm to 850cfm depending on the model.

A 750/780 cfm vacuum secondary or 750 double pumper would be best.

You can I-D a 750cfm carb from some of the other smaller holleys
by measureing the throttle bores.
A 750cfm carb has 1-11/16" throttle bores.

A old factory 750/780 vacuum secondary carb would be quite a find. They are superior to their modern aftermarket equivelent.
They have a shorter air horn ( to fit drop base aircleaners) , downleg boosters and finer fuel curve calibration.
They seem to run a little nicer.

Keep in mind a old pre 1974 Q-jet flows 750cfm also.
A Qjet will work just fine on a motor like this.
You're much more likely to find one of these.
It will require a rebuild kit and maybe some jetting.
You can buy kits and hi-performance parts for old Q-Jets from Edelbrock.
The old (4MV) Q-jets are simpler and easy to work on.
The ones with the right angled fuel inlet fitting are the most desireable ( chevy), but any will do.

Post the numbers on the carb choke airhorn from any holley carbs you find and we'll tell you what they are.

 

i dont want to go back to a q=jet, and im running an edelbrock 600 right now... im just looking for a 750 double pumper or something that i can have fun rebuilding for the heck of it and pop it on and tune it and see if it does better than my edelbrock...