GOT MY 383 finally

Like the guys above said plus you're looking for 10 to 1/10.5 to 1 compression so if you get the deck machined for flat (highly recommended) you'll need to take the appropriate measurements to source the correct pistons. Also you need to decide whether you're going to go with pocket porting the iron heads you've got now or go with a set of Edelbrocks for big $$$.

Terry