1990 into a 1986 3.8

Will an engine and transmission from a 1990 lesabre fit in to a 1986 3.8 lesabre? I would swap the sub frame with everything on it if possible,thanks Doug.

Different electronics trans was first year for electronic controls and engine harnesses different.

^ That would be a no. If you had one from '87 then you would have a good chance b/c that is the year that the Vin C was first used (same as in '90)