Am replacing the brake booster on my 70 SS (re-plating). Is there an adjustment spec for the rod that attaches to the brake pedal. My books only give specs for non power brakes. There is about an inch of adjustment on the end of the rod where the clevis attaches??? Old booster rod was adjusted for maximum lenght. Also, should there be a brake pedal return spring? The assembly manual shows 2 types of springs used but I have been told that there was no return spring on the power disk cars? As always, thanks for the GREAT help.