Weld on sway bar tabs

I really don't think so, without a lot of grinding on them, to mate up to the bottom of the LCA, not like the B body one's, welded on the top end of the arm.
But i personally never have tried to weld B body ones on, for an A body application sway bar.

It'll work. The tabs aren't exact reproductions of the B or 73+ tabs either. The tab itself will not sit at the exact same vertical level as the original tabs did and you may have to bend them open a little to clear the strut rod. The height can be corrected pretty easily with the length of the end links if it needs to be. The end link bushings are pretty thick and forgiving.