Thanks so much for the great information, Alan! I'll pass along the suggestions you made to my machinist. I think part of my problem is not knowing the right questions to ask, but you all make an excellent point. He came highly recommended, although I think his expertise is in NASCAR engines. So maybe I'll have to re-think my plan.
I'm on my way to New Jersey to pick up the blocks I found, with a side trip to Atco. The adventure continues!
Lew