Confused about disc brake set-up

[joesscamaro]

I'm trying to figure all this brake stuff out, and for some reason, it is not processing in my pea brain. I have a '65 that I'm trying to convert from drum/drum, to power disc/drum. I bought upper and lower ball joints for an '85 thinking that I was going to also convert to 5 lug. I've changed my mind, and I'm going to stay 6 lug. I know the drop spindles for 73-87 will work with these ball joints...but, what year rotors will work that will allow me to keep my 6 lug set-up? I'm going to go with the 2 1/2" CPP drop spindles if I ever figure this stuff out. Thanks in advance!