Theres alot of ignorance in your statements there. I doubt you have to get new headers, and I bet if you phone wilwood they would sell you the parts to change your brake kit to a kit that uses mustang II based spindles. It's not ford parts at all seeing as it's just spindles. Bills a good dude and I wouldn't hesitate to purchase any of his products.
I've never heard of Bill using used parts in any of his builds. Thats a pretty libelous statement. I'd be careful (white trash) saying anything like that seeing as he could sue you.