AGHRMatt posted:C'mon guys. Work with me here. Think CF7.
Nope, disallowed.
The OP asked for engines 50 plus years old. In my way of thinking, though the F-units on which the CF7's were built upon would have been 50 plus years old, the end result (CF7) is a product of the late-60s/early 70s as I recall.
Ban him! Ban him!