As said before, check the bores with a mic looking a taper and Bore. If your within .002" of spec get a good set of speed pro hyper pistons, if your .004" in spec get a set of KB forged pistons and run them. Hyper and forged pistons grow with heat. Not only that .004 with forged pistons will take a 200 shot of NoS with no problems.

If your over .005 get it bored. Else you will end up with piston slap that will drive you crazy.

I have honed and reringed many engines with success with clean bores. You have to mic them out to be sure, your eyes will have a hard time detecting a taper or .005"