rate this stuff for add some horses on a 318

if it were me i would probably put a little more thought into carb and valve size. sounds to me like you have a 2 bbl head which means that the intake valve is about 1.74 and exhaust is about 1.50 no matter how well they are ported or gasket matched flow will still be down. for the carb i would go with a 650 holley double pumper not too much and that is about it