Have you thought about a granada spindle and a larger rotor 13 inch with cobra (PBR) calipers?
I would like to get bigger rotors however I have granada spindles and I haven't seen an available kit that will wirk with the granada spindle. Since my drum spindles are long gone I would have to find some 70+ drum spindles to get a large rotor kit to work.
Thanks
Ryan
Look for a kit designed to convert a stock disk brake classic stang to sn95 cobra brakes. Every kit I've seen says "Also works with Granada spindles except you have to drill out a mounting hole to a larger size" which is really easy to do.