Machine shop 440 Mopar questions?

I'm a new machinist, I like to have the Pistons before boring to measure them, that being said every oversized piston that I have measured is smaller than the finished bore. That is the clearance, so that is acceptable practice. It has already been stated but I toss 2 cents into the pot.
On the torque plate deal I'd think that long bore of a 440 would be a highly recommend candidate for use of torque plates, there's alot of metal to shave, that minimal heat translates to tenths of thousands of distortion so when it cools it can have more clearance, but I have been leaving between .002 -.003 under for honing & measure each bore in multiple areas multiple times until I creep up to my .0005 needed for the finish hone. Usually it's really straight. But when the head is bolted on it will pull and distort the bore, how much I don't know that yet