[Donovan]

If I was working on an A-body and wanted to retain original 14" rims I'd look into mid 80's G-body brakes and spindles.

With the proper adapter balljoints and tie rods you should be able to bolt in the tall spindle of a G-body since the spindle is essentially the same as the Tall spindle on a 12" rotor conversion with B-body parts, but with a shallower mounted caliper.

The G-body STANDARD discs use a rotor about 10.5" and would be the best chance of fitting in a 14" rim. Worst case you will need 14" rims made for disc brakes, which are out there.

Still need to check for caliper to rim face clearance but it would be a good chance. The knuckles and brakes are dime-a-dozen in the salvage industry and can be had cheeeaap. This also allows you to have discs that you can maintain with parts from ANY parts store.

You could go a step further and get the rear discs off of an 82-86 F-body, and bolt them on the rear. They fit in a 14" rim too. Then buy a cast iron 4 wheel disc master cylinder for the 79 WS6 TA. Bolt a combo valve from the same into the car and you have a done package behind stock rims.

With this setup you have the improved suspension geometry and brakes all in one move. I have not done the swap but the impression I get is that people have completed it with no need for the tubular arms.