Suggest you at least identify the piston and ring first. If it is a custom you want from Ross, JE, Diamond or others, talk it over with them. Or if you want to use a shelf stock piston, pick it from a catalog before you bore. That way you will know what is available including rings.

I had a B block 400 bored for 20 over and that worked well... but the 400 has a bigger bore size to start with.