Just thought I would add a note about my latest finding:

In putting my engine parts in order, I am looking for main bearing shims. I recently bought a set (there were actually 16 in a packet) of .002 inch thick shims for the rear main bearing (made of cold rolled brass). These were GM parts and did in fact measure .002 inches thick (packet was .032). The one I removed from the engine was a single shim of .006 inches (also cold rolled brass). I also have another set of cold rolled .003 inches made as an after market (NORS) from ebay. I have heard Gene talk of .001 in thick shims also (these being aluminum I think). After invading my wife's supply drawer in the kitchen, I found heavy duty aluminum foil that was also exactly .001 inches thick. I had it in mind to cut some shims of it using the real ones as a pattern (?), in case my assembly is exact enough to try a precision fit on the mains.
Mike

Mike,
Thats exactly what I have done....good old Renolds Wrap. That way you can get the adjustment just where you want it.

Gene,

Thanks for letting me know I am going down a previously traveled path that leads to a successful outcome. I appreciate knowing it works!

I have not yet figured out how to neatly cut the holes for the main bearing bolts. I will trace the outside perimeter and use a scissors on it; but the round hole, I have no yet tried to cut.

Mike

I don't know if it will work you could try a paper hole punch but back it up with a thin piece of cardboard.