You must do a sonic cylinder wall thickness test before you do anything else.
While your block is at the machine shop you should also perform a magna flux test for any unseen cracks.
I am just going through this myself and have been told the minimum, at finished bore size, should be 85,000's thickness on the thrust side of the pistons.
Thrust sides are on the right-hand side of each cylinder bore when viewed from the rear. Outer walls on cylinders one through four, and inner walls on cylinders five through eight
Larry
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