magnum head porting / pushrod pinch area / etc

I might have one of the last un used magnum porting template kits,lol! O.K for magnums the bowl is actually quite good. The pinch is the really big restriction. I dont recall how much material is there at the pinch,but it's not a whole bunch.I'll go look at my notes and see if I can find the best gains for you. The cam choice has to be made with the magnums fantastic exhaust ports in mind.A single pattern cam is a much better choice,as is one with fast ramps. If you can find a roller like this your set. Also,there is a set of chevy beehive springs for sale here which you will need.That is the expensive part of upgrading magnums! Springs from Mopar will run you $120-130,but the chev ones are easily $40 less.