Yes, you can weld the bolt closest to the torsion bar. I would just "tack weld" the head of bolt in a few spots though (to much heat can cause the metal to become hard and brittle). I have an idea I'm going to do with mine that I will show when I have time (not much longer) to work on it.
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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