I wonder how many of the youngins around here even know what a RA3 or RA4 is.
Try poking around
www.transamcounty.com There is a pretty good pontiac site out there, but I can't think of it right now.
I don't think the motor itself matters. I would imagine all the accessories were swapped. But that was also a long time ago. I'd check belt tension, pully angles.
Where are you and do you do any work yourself?