I would save yourself the hassle and time right now...have the bore measured...not just at the top but all throughout the cylinder by a machine shop...go one bore size up with new pistons...WAIT till you have the pistons in hand and let the machine shop bore to piston spec in hand..then you can assemble with confidence. ..
Also...couple aftwr assembly pre fire requisites. ...
Leak down test
Compression test
Squish test
All important steps to save you money and time in the end