71 Dart disc brake conversion
craigb,
I too have a 1971 Dart (GT) that had the manual 10" drum brakes.
I immediately installed the SSBC front disc brake conversion kit. It was pricey (~$830 at the time) but it was very complete and nearly jumped onto the vehicle by itself.
The SSBC kit allows either the large bolt pattern (5 on 4 1/2") or the small bolt pattern (5 on 4"). My car also has the factory 8 3/4" 3.23 sure-grip rear end.