I think whether it's an IA block or MR1. (Iron or aluminum)You buy the block that meets your application.
In fact have it finished to whatever rotating assembly you plan on using.
Choosing your builder or machinist is an important decision.
Avoid shops that employ "Monkees".
(Deb's cousin is a good machinist, but he got very little work from me back in the day, unless he personally did it and kept it away from his "monkeys"! We no longer live close enough that I'd bother to use him for anything.)
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