"you will pick the pistons that you [want] for that build."
Exactly that would be green field except for the block. the "garage's engine" as my wife will undboutly call it will, will have a curated parts list.
if ultimatley I decide to go full 427, the block would be aftermarket also.
Well, yeah. You're into it up your chin at that point.
When I built my DART Stroker, [years] ago I over shot. Before I knew, I was $10k deep and that didn't include upgrades for the Kenne Bell.
Mine is a 347 (It's uh, kinda in the name)
Overbuilt but very reliable. It's the [rest] of the car I need to dig into. LoL