I'm not clear on what you're trying to achieve with the mixing and matching of parts. 57 cars are independent front suspension, 53 trucks are straight axle. Totally different in all regards.
Anyhow I do like your out of the box thinking. It seems that you already have the Wilwood setup. Sounds like a whole bunch of machining involved to get it to work. A simpler solution would be to use late model Silverado rotors or even Toyota rotors on your stock 53 truck hubs. Then have a bracket made for your calipers.
