My bad, I measured between centers which isn't going to help you.
I just measured between the studs on an old MR/R bell housing and it's 1.50 between the studs.
I had the bell housing off when I pulled mine though.
The claw pivots so you can insert it.
https://www.summitracing.com/parts/wmr-w89326?seid=srese1&ppckw=pmax-tools&gclid=EAIaIQobChMIx-OztdjqiAMVUTcIBR0myiwAEAQYAiABEgLA-vD_BwE
Does the 1989 70hp have the power trim pump that is external to the motor with 4 hoses?
If so, it should work on the 1982.
You'll have to look at both motors and see if the mounting points for the rams are in the same place.