It is a 72. The brand X booster and master cylinder that was in there had a proportioning valve in line. I used the same valve with the OEM booster and master cyl that I put back in. I bled the system first without the valve as I was told the car originally did not use one. Second time around, I put the valve back in and re bled. It made no difference. The front calipers are grabbing, but with the rear wheels off the ground, I put it in gear and applied the brakes. The rear wheels kept moving. Also, I don't know about the centering tool for the valve, so of course I did not do that!