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Standard Disc Brake Converions- GM A-body, F-body, X-body 

1967 was the first year for disc brakes but they used dual piston calipers. 1968 was the last year of the dual piston caliper. 1969-74 all used the improved design single piston caliper. All disc brake conversions use the improved single piston caliper.  All cars before 1967 had no proportioning valve, just a distribution block on the frame. 1967 factory disc brake cars also had a distribution block but it worked in conjunction with a barrel-shaped hold valve that hung off the stud of the master cylinder making this a two part valve. In 1971, a new one piece improved design was implemented and this valve was not succeeded until 1986. This new style disc drum valve is what is included in the conversion kits.