I'm not going to complain, either. A PA with a 251 engine inside isn't that much of a stretch ...
MUCH less so than any EMD or other Christine Jorgenson repower; it could even be argued that most of the 'experience' is the same from a modern 12-cylinder 251 as from a debugged-as-far-as-possible 244. To say nothing of the fact that apparently there are no 16-cylinder 244s anywhere ... or, perhaps more importantly, any cranks to install in fabricated blocks, which really shuts down any thought of producing one right there.
and keep in mind the Rock Island FA1's that were repowered with 567 engines and later re-trucked with Blomberg trucks when the Type B trucks were needed for trade-in for U25B's.
The thing here is a bit different - Blomberg trucks are prototypical for a Rock Island FA 'restomod', but there really isn't any way Erie-built trucks work under anybody's PA. (Keep in mind that the visible pieces from the Brazilian trucks are all correct for duplication, if any purists want to ante up the funds, cold hard cash please, to make the 'right' trucks for one of these units.)
Part of the situation with Flying Yankee, as I understood it, was that the proposed 567 installation was to be made as 'modular' as possible, so that little or no change in the historic fabric of the train itself was needed to install the more reliable and infinitely more maintainable engine. It could be argued (I myself would so argue, but I don't know the full 'internal' or political story) that spending all that money on restoring the 201A to operating condition would much better have been spent on the train itself -- Preston Cook, who knows as much about these engines as anyone, thinks it extremely unwise to actually operate using any 201A. That's not to say the money was wasted, as having at least one 201A in fully restored condition is important historically ... just saying that if the train is to recoup the money, time, and trouble put into its restoration by running in excursion service, it makes little or no sense to run the restored 201A into the ground doing so. I don't want to open another can of worms discussion about where the Flying Yankee restoration is going, but I definitely think a 567 (ideally D block or later?) is a useful part of it.