got a 350 n wonderin if i should put a 600 or 750 carb on it..which will have better performance?

 

Depends on a lot of things. More engine info is needed. Stock? If not what heads, intake, cam, exhaust, etc.

 

its a stock 260 horse goodwrench 350 my buddy just posted it in tech general engine reapir then i made my name cause i just got my car hes right next to me he says the only thing thats not stock about it is that it has a weiand dual plane intake on top of it...

 

I would go with a 600cfm. It will be plenty. Even with a 330 hp crate engine they recommend a 650. I have a 600 and am happy with it.

 

thanx man appreciate it

 

650 double pumper would be nice on there and give you some room to grow, I wouldn't buy a 600 when the 650 isn't much price difference. For a performance minded thinking skip the vacuum secondary and stick with double pumper. I'm sure at swap meets, etc you could find a used one easily enough.

 

yea i already have a 600 and the 750 i just dont kno which one to throw on

 

If you already have the 600, then use it instead of the 750.

 

Use the smaller carb.

You have an exact duplicate of a 165 HP mid-70s smooger motor, from the deep depths of the ultimate anti-performance smogger era. With the cam that's in it (the 929.... .390"/.410", 194°/204° @ .050" more or less) it will NEVER EVER draw in 600 CFM of air, let alone any more than that. Just to give you a reference point, Comp "rates" its copy of it for use from 600 to 4800 RPM. At 4800 RPM, a 350 with 90% volumetric efficiency will use about 435-440 CFM. And I doubt that motor can even do 90% VE, so its actual air flow requirement is probably even less than that.