I installed one on my 1963 C10 when I still had drum/drum brakes. I made a video. Some parts of the video will not apply to your 1965 C10. As I recall, the 1965 brake pedal pushrod is longer than the 1963 pushrod.
I honestly don’t think it matters if the rear brakes use the front or rear port on the MC.
Dual MC upgrade C10 video

Last edited by Lugnutz; 04/14/2023 1:52 AM.