Funny I was just reading an article in the January 2020 issue of Hot Rod magazine page 88 thru 91, that goes into a lot of depth about disc brake swaps.
There is discussion about rotor size and wheel clearance on page 89, and about master cylinders on page 90 & 91.
Good luck!!
One other thing, I have checked out a lot of the disc brake kits and none of them say you can use 15" original wheels with there kits. From my reading I do believe it can be done with some grinding.
Last edited by TRUCKBIZ; 12/07/2019 11:38 PM.