Carl, in my opinion and it doesn't account for much
Model A blocks being a 'dime-a-dozen', well maybe and maybe not if you want a good one. As time goes by the good ones will get harder to find.
As a comparison, one thing for sure in the Ford Flathead world, good Flathead blocks are even harder to locate. As my dad told me in my youth (and he was a Ford man who owned many Flathead Fords new and used) 'There are two kinds of Flatheads. Those that have a cracked block and those that are GOING to have a cracked block.'
Model A's engines are easier to deal with than Flatheads and Terry's new block will continue this hobby for generations to come. They will make it a better hobby than what it is already, and for you guys that like to push a Model A to the limit you blow an engine huh so what let's build another one