Ouch!
That arm is bent! You might want to source another set of trailing arms. The camber will be out of spec, and your new ball joints may bind at that angle. I restored a '79 Vert for my father-in-law five years ago, and his ball joints pressed out OK. I have a ball joint press with correct receiver tubes so no stress was put on the arm itself. I don't remember the arms having that much angle. (they were straight IIRC, not angled down like that)
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG