I am in the process of freshening up a 75 model 350 to go into my IROC. I have the '883' 76cc chamber heads that came with the motor and I have a set of '441' 305 HO 58cc chamber heads from my old motor. If I build the 350 back basically with just a mild cam, which heads would make the best all around power? I've heard of guys putting the 58cc heads on 350s just to up the compression for more power, but I also know the 76cc heads will flow better. Anybody out there do this and what results did yopu get? Opinions anyone? I'm on a very TIGHT budget, so for now these are my only choices.