I hope this has not been posted before (did not bother to search - doh!).
There’s a YouTube channel called MacroMachines by a kid who is extremely talented as a fabricator and machinist. He has been building an Indy roadster-type vehicle totally from scratch. In one episode he shows how he designed and built adapter plates from his XK engine to an early Ford bellhousing and then to a Chevy T5 transmission.
It’s a good episode; I have been watching his series from #1 and it is great. This kid is quite accomplished.