have a 406 thats built pretty decent want to know if a 650 double pumper would be an ok carb for it i have a 7xx edelbrock on it now and its a pos jsut dont want to have to small of a carb and choke it out, has dart intake, world product cast heads, dome pistons, cam is a mystery as this is a mystery motor was built when i bought it with no paper work sounds like has a decent cam in it when its running and does not make very much vaccum as my brakes suck need vaccum can