disc brake deal on craigslist, will it work for mine.

You can keep your uca's, as they're already the large ball joint style. You can get spindles and brakes off any FMJ car, so diplomats, fifth avenues, new yorkers etc all the way up to '89, so you can find them in any wrecking yard.

And ignore the Mopar action article on the fmj parts, it's flat out wrong.

http://www.moparmusclemagazine.com/techarticles/suspension/mopp_0503_swapping_a_and_b_disc_brake_spindles/index.html