Can oversized forged pistons be shaved down to a smaller size? Better yet, can I buy +.060" pistons and have the shop shave them down to the appropriate size once they know what that is?
No, pistons are not perfect cylinders and have some taper to them, particularly at the crown.
Dollar for dollar, the best price per value on pistons is Tlowe's .040" forged pistons. Unless you have some rare block just bore it. The only real shame in boring a turbo engine is the thinning of the cylinder walls, so you may want to sonic check the block first. If the walls are already thin, it probably isn't a very good block to use as a turbo engine to begin with.
