Checking deck height
Screw all this measurin ****. Disassemble the thing and let your machinist straighten it up. You're trying to do his job and you're handicappin yourself, because you don't have the right equipment. No offense.....You simply cannot get an accurate enough measurement doing it that way. You already know the block is crooked from the preliminary measurements you've taken, so.......take it to the shop. He'll fix it.