Ed I've been planing a simular engine for myself. The only source for overbore forged pistons that I could find is Patrick's. I think they are a bit pricy but they are Vinoloas and I am still stuck in the 60,s. I,m not sure you need unleaded seats these engines were designed to run on low on no lead gas I'm not sure about the cam, I would talk to a good cam grinder about my plans.I suggest DELTA Camshafts of Tacoma Wa ,or Colt Cams of Langley BC Canada. Good Luck If a little is good more is better and too much is just right
