I'm impressed with the research! If the rearend is indeed out of a 75 Nova you may have a problem. Seems like 68-74 Novas had the same dimensions on spring perches as first generation F-body. They changed it in 74 or 75. Can't remember which.
I would say measure the spring perches (distance apart) and compare it to your old rearend. If they do match, there is an adaptor u-joint to go from pontiac drive shaft to chevy rear.
good luck
steve
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