Those old Fords were pretty flexible. When I was young (and didn't know better) we'd swap out trans, flywheels, auto to stick, stick to auto. Heck we were always goofing around with "parts". Never noticed a balance problem. But that old early 60's auto tranny let go at about 110 mph one day. That got exciting!
LONG streak of red
oil and parts for about a mile, lol.
Ernie