Can I make this work on pump gas?

It is sounding like this might be more trouble than its worth. I am willing to try polishing up the heads, thicker gasket and new cam if it would work.

If I went to E85, will it eat out the gas tank? I already have fairly new carb so that should be OK.

If I swap out pistons then I need to rebalance correct? Then it gets into might as well rebuild.