upper tubular control arm bushings

Well, if the tubular UCA's have bushings, they should be using the stock style cam bolts. Should be. All of the bushed A-body tubular UCA's I've seen re-use the stock style cam bolts. But there's a first time for everything.

But the bushings could be anything, and depend on the manufacturer. Pictures would help immensely. There are several different manufacturers that make (or have made) bushed tubular UCA's for A-bodies, but there are also a couple different styles. Even just a picture of the shape of the UCA might help narrow it down.