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Issue with older cars is that they may not have the original/ correct for that year axles.
My 79 had original on one end and a splined unit on the other end. Spent allot of time on the phone with Roger when I did mine as a result before getting the right boots.
So sometime after leaving the factory someone had replaced one axle with a later setup?
If the joint is stuck, use a gear puller. Mine had different axles as well. I had to scrounge for a stub shaft and axle so I had a matching set to rebuild
dont wail on it to hard. i would soak and try the puller. i had one that was super stuck and did the heat/puller trick. and don't heat it up to much, don't want to mess up the metal.