How Much Can Heads Improve Compression???

Option B Those are some nice looking heads! I would have chosen 302 castings if it was a option. The 920 chambers are very close the the 302 chambers and the ported runners are as good or better than the 302's. You should raise compression a half point without pistons or a lot of decking. Or you could leave the compression low and do a Rusty Mod or 70 Duster mod! LOL