1969 Barracuda upper control arm issues.

How bad are the threads? They always look a bit messed up. The question is whether you can tighten the new joints to the correct torque. If you can't, the correct procedure is to tack weld in three or four places. One key to getting the new joints in is to spin them backwards until they drop into the first thread.
I cleaned up the stock arm and installed the new ball joint without any problems. I am working on getting it running and driving right now so money saved is good. Definitely going to put the tubular arms on my list for a wintee project. Thanks to everyone for the input.