65 CUDA suspension help

My 64 273 4 speed was 10 in drums all the way around. I'd find a set of Kelsey Hayes original discs, 65-72, for the small bolt pattern or 73 up A or E disc setup for the large bolt pattern. Stock high performance handles very well with at least .87 torsion bars and front sway bar. Use the best MOOG parts and 6 leaf HD rear springs. What bolt pattern are the wheels you have now?