got 441 heads cause budget shrunk do to buying house but what would be th better cam 268 h xtreme energy or 274 is xtreme a better cam than the comp magnums pistons are flat top roller tip rockers .030 overbore and edelbrock eps intake if that helps have not done anything to heads yet but i got them for 70.00 bucks what should I have done to them still looking to get 350 -400 hp range