Montana:
if you are going to do a clean out and inspection, pull the piston and rod out of the cylinder
check the crank journal for scratches indicating sand
check your big end brgs for contamination
check up inside the piston, really well!!! there may very well be casting sand stuck up hiding under
the wristpin bosses, look very carefullly, pick around wash well,
remember anything inside the underbelly of the piston "will" end up in those godforesaken top lube holes
in the connecting rod, the ones that feed the big end brg.
while you got your head off, check the liner protrusion, you might have to clamp the liner down with a strap
because the head is off, but check it! if it is somewhere from .003-.010" you are probably ok, but
there are many reports of .020 or more which is an indicator of sand or swarf under the liner lip.
if your liner is too high, pull it and check for crap, otherwise you will likely have head gskt leakage problems.
there are lots of things to check, but these are the main ones that pop up with some regularity.
there really needs to be a list made of all the things to check in order to put one of these engines into service.
maybe a short list of the most blatant issues, and another list for a full on teardown, inspection and blueprint.
bob g