Weld on sway bar tabs

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.
The 66-69 B body tabs also mount thru the shock absorber mounting bolt hole, which the A body mounts don't have a need for.
How much of a modification has to be done to the B body ones?
You ever do this for any of your cars?
I'd like to know, for future knowledge about this.