You are well within spec for standard bore for a Mark 75 unless there are terrible scratches/what not in the bores. Block finish hone for a standard Mark 75 is 2.442, from your numbers your right there. This is a service motor Dock Buster I am assuming. My suggestion hone out the 2 cylinders in question and see where your at I would stick with the standard bore even if your a little over this is a service motor. FYI to go the next step .015 over yes you need pistons and rings to match then Block Finish hone for .015 over is 2.457.
Travis
