Awww, you've messed up already. Those are cheapo rebuilder pistons with a 1.540" compression height. Geez, I wish there was some way that you fellows knew to ask someone who knows this stuff before you buy this junk. To get to zero deck now, you'll have to remove about 0.045" from the decks instead of 0.025" if you had used the correct 1.560" pistons. Then the decks start gettin' a little thin and may not hold a head gasket and you have to whittle the heck out of the intake manifold to get it to line up and yadda yadda.

If it were mine, I'd remove those pistons and sling 'em over the fence, than get on the horn and order some decent pistons like these that would make 9.35:1 with a 72cc head....
http://www.kb-silvolite.com/kb_car/p...tails&P_id=156

But hey, it's your motor, do as you wish. Pat McCarthy may have cut some decks this thin in the past. Maybe he can tell you what to do.