Small update: The CPP parts don't seem to fit right. I wrote an email to customer service asking about it, so no final judgement - but I honestly don't think I'll buy much else from CPP.
Despite that hiccup, my buddies at work were feeling *really* helpful and so we cleared off our alignment rack / junk collection and pushed the '57 indoors. Now I've got a well lit, clean, dry & level place to work on the truck. Like so:
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When I hear back from CPP, hopefully before lunch break today, I'll start actually test fitting for where I want the motor to sit. So far, all I know is "as far back as I can".
I'll probably be taking the steering box off again & maybe knocking some rivets around. We'll see.