Maybe they will bolt on, but I doubt if 70's Torino spindles are a very good match, geometry wise, for a 56 Thunderbird. You may end up with all kinds handling and steering issues, which can make the car unpredictable to drive.
Here's a kit that uses the stock spindles.
http://cgi.ebay.com/ebaymotors/ws/eB...1&tc=photo
Maybe you are able to figure out which components it uses if you want to save some money. To me, it looks like they use Fox body Mustang calipers. Rotors could be Granada or something similar. The Thunderbird spindles accept common A2/A6 bearings (65-69 Mustang type). Those caliper brackets are probably custom made by the seller, but they look quite simple, so maybe a machine shop can make you some.
BTW, cool car and nice idea to do that for your dad!
<font size=-1>[ This Message was edited by: Helmantel on 10/20/04 12:21am ]</font>