Can I make this work on pump gas?

This is the 318 I asked about the scratches in the cylinder. It has the p4120281 11.5 pistons in it. It had x heads on it, it has been run, I don't know how well it worked. I cc ed the heads at 68 cc. As best I can tell the pistons are zero deck. When I put it .5 in the hole it calculates to -12 cc for the piston.

That calculates to11.3 with a .040 gasket. There is a Crane 272 cam in it now which specs at 33° ABDC. That shows as 10.45 dynamic CR.:banghead:

Am I wrong (I hope). :prayer:

Can i make this thing run on 91 or even 93? Should I sell the heads and put the money into something else?

I just don't want to spend more time and money on something that just isn't worth the trouble. Thanks