383 with Eddy heads!

Alright i just wanting to check something here.If i was to use kb162 pistons and decided to take my father in laws offer on the 516 heads,what would i need to do to make this setup work with voodoo 60303 or xe274 cam?If this setup wont do much better than my 318,then i want to buy the 84cc eddy heads.I am staying between them two cams for the torque.If i run the eddy heads i will run 1.6 rockers.But stroker is out of question here.My main concern is which piston is best choice.I havent bought heads but want to order cam soon.You guys are big help and i am on budget.So which pistons and which heads?