Disk Brake Conversion Advice

Re your question of front disks w/ SBP wheels, there are two options I know of. The original 4-piston Kelsey-Hayes setup and the Scarebird conversions (9" or 10" drum versions, Chevy & Toyota parts and drill rotors). The K-H parts are getting rare and expensive, though almost the same was used on Mustangs. Simplest is to buy a whole refurb set which a guy near me rebuilds on the side and posts here occasionally, but ~$750. You would spend almost that much to piece together a system yourself, and a lot more work. The disks used to be ~$90 ea, but now $25 from Centric. I bought 2 for a custom plan. Wilwood and SSB have kits (~$1000), but check if they still allow SBP. For all front disks your existing wheels may not work unless 14" or even 15", depending on the exact wheel.