If you have the heads off the motor now I would have you check all eight pistons at TDC and use a small thin bladed screw driver to push down between the piston and block on the cam side first and rock the piston over towards the other side of the cylinder and check the height of the piston edge on that side(cam side), do the same by using the screw driver to rock the piston towards the camshaft on the motor mount side and measure the height of the edge of that piston on that side also
I've seen between .002 and .017 differences in piston deck heights at the edges of the pistons checking them that way, I had some touching the heads their with a .039 thick head gasket with zero deck height pistons is the only reason I found them