Hello Brake Experts. My '65 GTO power brakes were converted to front disc brakes by the previous owner with stock drums on the rear. When I bought the car the brake pedal was hard and had little feel like you would expect with power brakes but it did stop ok. I adjusted (shortened) the push rod from the brake pedal to the booster trying the lower the brake pedal and hopefully gain more brake feel. Now the brakes feel like there is no boost at all, the pedal is hard and the car does not stop well at all. The booster is getting plenty of vacuum directly from the intake manifold. It has a mild street performance cam. I do not know what brand conversion kit was used as there is no name on the booster or calipers. The discs are drilled and slotted and the master cylinder is a dual reservoir type. There are no leaks and the reservoirs are full of fluid. How's a good way to test the booster to make sure it is working ok? Any advice is greatly appreciated. Thanks!