I went with the 85 Dodge Diplomat MC because I actually have 10 pistons in my brake system,Wilwoods on the rear and factory discs on the front.
The tech section on the Mark Williams site suggested a 1" bore with the brake system I'm using. I'm probably going to finish my brake upgrade this weekend so I'll post back and let you know how it fits.
Gus beer

64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60