302's and 051's have the swirl and the closed chamber , but are not good performers. These are not going to perform any better at that level than 915/587/596/974 open type. The runners intake side are less than 130cc. Do you realize the potential of that small a runner? They flow 150cfm at .5 lift stock. A simple Magnum swap is a great way to maximize a mild build. Easy 30-50 hp over a lower wider torque band.
The oe magnums are 172cc and flow 210cfm , the chamber is 64cc so you will like to mill it.
I cant suggest any cam. Not without gear car weight stall,,,you get it.