Am I ok with this? KB107 in La block

RustyRatRod said

Most shops around here install the two end pistons on each side to get a good idea of squareness. Remember too, to take your measurements from the non thrust sides of the pistons. That's the front and rear. Otherwise, it might be possible to pick up some slop in the wrist pins. Especially if you assemble with no rings. It's possible either way.

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Beat me to it lol. Installing the middle pistons is a waste of time since block deck surfaces typically aren't wavy.

I made the mistake of only checking the height of one piston back when I put together a 360 LA with KB107s and Magnum heads. You likely have one deck taller than the other, hopefully not by as much as your quick and dirty measurements show because .040" difference is quite a bit. Square decking based off the crankshaft centerline is the way to fix all of that but not all machine shops have that capability and it's more costly. Confirming how much difference there is between the two sides then having the taller deck milled down to match will still be a big benefit.

I believe the "depth mic" is also called a "deck bridge".