Alright I guess I will put in my .02 cents worth here... I purchsed a Eagle forged crank, forged I-beam rods and hyper pistons. I would recomend getting better pistons..forged if you can afford it. Are you going to put nitrous to the car? Forced induction? If so keep in mind about your compression ratio and cylinder head cc's. It all factors I screwed up and forgot about the blower aspect so I have to get new pistons to handle the boost-so I was told. I am running the comp cams XE274H. The cams lift is .520-.523 the duration is 230 and 236 the Lobe angle is 110. Another thing you- what trans are you using rear end-etc? Are these items already beefed up? My stock C4 blew up after about 3 months with that 347. I had it raced built to handle 600 hp so I will be good for now. Just remember any weakness in your drivetrain after the engine rebuild and it will become painfull obvious after you pick up the pieces. Good luck!