Dear Randy;
Next time spin the pump till it reads on the guage and watch while running too.
I've never seen/heard of the pins siezing either, especially in 10 sec etc. Something else went wrong there.
The Dist. shaft should go into the pump a 1/2 inch. Check the HEI against a stock one to be sure they are exactly the same lenght too.
Also; How tight is the bolt that centers the pump??
