Classic Performance Products makes a few conversion kits(mine is a front disc set up, using ford 5 x 5 1/2 disc, with gm rotors. No limit Engineering also sells kits and conversions for the F1's. I recently got a ton of catalogues that have F1 stuff. I peruse them and post yah if I see exactly what your looking for. The front disc conversion was super easy, using your stock spindle with a slide on bearing adaptor. (actually one of my first hotrod projects!)
If you change your mind and want to go with a disc setup, wildwood brakes are very popular here!