Nope,
you're right Kmutt,
Pinwell sells whole engines, and some parts,
but I'm afraid you're looking an an engine from them.
Another alternative is a machine shop that can weld Aluminum.
heliarc it and machine it back down.
Another alternative, and much cheaper for sure is,,,,
Let me tell ya a story.
Back about 10 years ago we had a real cold winter.
I had a chevy with a 454 motor in it.
It got so cold it cracked the block from freeze plug to freeze plug
but didn't blow the freeze plugs out.
Weird I know, but it happened.
Anyway, I took some JB weld and a toothpick, pulled the freezeplugs out,
and rubbed it in the crack then poked it in with the toothpick ,
then after it dried good, reinserted new freeze plugs.
it held for another 4 or 5 years and never leaked a drop.
When I finally sold it, it was still running.
Good luck whatever you do.