I've seen 1 sleek rebel with a WJ pump in it, and have heard they also had the YJ pump, If it has been energized, especially the YJ, Its a good start.
On 1/4 stringer, check the floor for rotted wood/soaked floatation foam
.
Olds power, @ 80?...Hmmm
Bring a gps on the test ride, and take $100 off for EVERY mile per hour it falls short.
Good luck
Dan'l