Disc brake small bolt pattern. Going to front big bolt pattern

I have a 1972 Dodge Dart slant 6 car that has Factory disc brakes small bolt pattern. In the front. What parts do I need to change to go to big bolt pattern disc brakes on the front? I really appreciate everybody's help also Going to small block V8. We have 16 degrees here in northern Michigan Traverse City Doing a lot of inside work. This Thursday. February 13th 2020