I think I may have solved part of the problem of using the tall spindle conversion on a 64-72 A body. I had a 79 G body upper control arm and placed it on top of a 64-72 A body upper control arm, the contours are the same and the width is the same but they are about 1 inch shorter. I looked up some info on one of the after market suspension suppliers and there is a picture of tubular control arms and a stock 64-72 upper control arm, it looks like the tubular control arm is the same as a 78-87 G body upper control arm except it is not made out of stamped steel. The problem of trying to use the G body upper control arm on a 64-72 A body is that the spread on the upper control arm shaft bolt holes is different and it will not bolt to the 64-72 A body frame. It is not as easy as using the 64-72 upper control arm shaft on the G body control arm because the bushing mounts are wider on the G body spindle. If someone could figure out what upper control arm shaft would fit into the G body spindle and bolt to the A body frame, I think you could do away with the offset control arm shafts and excessive shim packs to convert the tall spindles to a 64-72 A body.
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