If you already have discs up front, but just wanting to change to big bolt pattern for more wheel choices, I'd get ahold of Cass at Dr Diff and see if he can come up with a BBP rotor that will work with the Kelsey Hayes disc setup.
That is definitely something I hadn’t thought about asking them. My FABO research has led me to believe that the only option for keeping the KH brakes is using ford hubs and having them machined to fit the spindle. I will run it by them in an email.
