The disc should be pretty easy, as the 10 spline 1-1/8" was widely used by GM going back at least to the 1930s. It is less common on later models as the hi-perf cars went to 26 splines starting in the 60s and some of the T-5 applications are 14 spline.
I would start with a 283 Chevy disc or something similar. Don't forget the light trucks, as they also used the same spline. The one thing to watch out for would be interference between the hub or spring cage and the flywheel bolts.
The pressure plate bolt pattern is standard 10", so almost any 10" or 10-1/2" diaphragm or coil spring (except Long type) pressure plate will bolt to the flywheel. However, you need to make sure that the finger height is compatible with the stock Buick release bearing. If you know the Jeep PP works, I can't see any good reason not to stick with that one.
Ray
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