whats the correct size carb for me?

[85/96gt]

hey guys need a carb just wasnt sure wich size to get .. was planing on a holly street avenger..my setup is stock rebuilt bottom end gt 40 irons e 303 cam edelbrock rpm intake 1-5/8's longtubes offroad h super 44's.. saw one on craigslist like brand new for 250$ but its a 670 thought that might be to big.. any imput ?
p.s any idea what kind of hp a setup like that should make?

 

[93 5.0 GT]

670 would work great its more about venturi size than cfm

should be somewhere around 280rwhp

 

[project67]

+1
if the carb is adjusted correctly, it will run just fine. i run a quadrajunk on my 67 that was built by a local guy that really knows his stuff. i had a demon and he built this thing for my combo-they're about 750 cfm or so and it really woke up my car-smoother acceleration, great throttle response, etc. 670 cfm with your mods (=good volumetric efficiency) should be no problem

 

[85/96gt]

ok thanks alot

 

[85_SS_302_Coupe]

650-670 is about right on. You could get away with a 600 and probably get snappier throttle response but you'll be fine with the 670 as it'll give you room to grow.