A Body Disc Brake Swap 101

so if you had factory discs sbp would you bother to upgrade or stick with them .also does any one know if you can just change the rotor to get bbp .

I personally don't like fixed multi piston calipers but... If I owned them I wouldn't spend to replace them. Very similar brakes were used on early Mustangs which did have the 5 on 4.5 bolt pattern. There are differences in bearings, etc.. to address. It has been done though.