By the time us bottom feeders get thru with the big show cast-offs, they are pretty much junk.
Had a block come in for repair a couple months ago, every throw and a patched window (some even had 2 patches) the oil galleys patched, deck welded, time-serts, lifter bores welded and sleeved, heat treat gone, kept spinning the main bearings because the crank was sideways, kept getting oil out the front and rear seals because the crank was raised .020 from line bore. And the guy wanted me to still fix it.
Yes there are still some good people and parts out there that still can be used, BUT--- from where you live, dealing with shady sellers and broke-ass racers willing to sell you junk knowing that its hard to come back to them