Ayuh,..... Welcome Aboard,.... Ya it'll drop in, but as noted, there'll be "Gotcha's" along the way,....
If ya could get the entire driveline, pulleys to prop from the '85,....
It'll be an easy swap, 'n Great up-grade,....
You'd need to "Tune" the key-hole abit, widenin' it slightly, 'n redrillin' 2 of the holes, slightly wider, 'n abit higher,...