Best heads
Ported stockers work quite well and can be made to flow in around 285cfm.
AFR, TFS and Dart all make aftermarket castings, they can be used as-is or ported to flow well over 300cfm.
Injector size depends on application and target HP.
A 383 with a decent cam and big heads is going to want 36 or 42# injectors.
So I guess the question is ... How fast do you wanna go? And how much you wanna spend to get there?

