EVILDR235 & CatDog,
Thanks!

I had been wondering if the block had been align bored with the shims under the caps: or align bored and then shimmed with the final eccentric bearings.

I found an old 1950's bearing manual this weekend. It does'nt go into the Chevrolet bearings much, maybe 1 or 2 detailed pages.
Let me read it a few times and I'll get back about what it says.