The 74 manual setup will not work , you will see the clutch cables come out in a different spot , and the brackets are from the early 71 up to early 75 , then they changed , the booster overhaul if they have a shop nearby runs 75 to a tad over 100, last one I had done was $60 , that was ten years ago , still works like new , if you can find someone near you that has one with power brakes and drive it , then make your choice, it’s a must have if your going to stuff a larger engine in it and need help to stop the beast ,