I'm rebuilding the distributor for My 69. How much end play should these distributors have? I have set my Chevrolet distributors at around .020 endplay with good results. This is my first Pontiac distributor. Also,. The Chevy's have a three tanged washer between the bottom of the distributor housing and the gear. The tangs face upward and engage in the bottom of the distributor housing. Are the Pontiacs supposed to have these as well? None of my Pontiacs have one? Thank you.