'90s Imperial window motors work perfectly in '64-'66 Imperials. The later motor is in a bunch of other Mopars that I forget. Late '80s trucks, I think.

The 1972-1978 400 or 440 cubed motor in any Dodge truck has a pair of manifolds that fit the 1961-1966 Imperials (tip courtesy Rodger & Gabby in Colo. Springs)

1977 Executive Diplomat II