Have your machine shop measure the current bores, and then with the shop's blessing buy the set of .040" over forged pistons and have the machine shop measure the new pistons when they come in and hone the walls to the proper size.
Keep in mind that custom pistons can be any diameter (as long as the proper ring set is available), so .040", .045", .050", etc... can be purchased. Would be a shame to hog the cylinders out more than needed.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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