I'm running a Mopar slant six in my '35 Plymouth sedan and back in April I had it rebuilt by a reputable engine builder. I installed it and broke in the cam, then I was ready to drive it for the cruise part of the year. I had a problem with the brakes, so I took it out to test them, at 60 mph on the highway, I heard a loud pop and it just died. I towed it home and pulled the distributor, the plastic gear was completely stipped of teeth. I have since replaced the gear two other times with the same results, after only less than 100 miles on the engine. I've contacted the engine builder and the cam manufacturer about this but no one seems to have definite clues to what is wrong. Hoping somebody here does. HELP, I'm getting desperate after not having a ride all summer. By the way, I'm running a three deuce manifold w/chrome 97s, headers and alot of chrome and it looks pretty awesome, but don't run very long at a time.