Tim, more great information. Just my luck to have a car vacuum advance distributor in my engines - yes - I have two, both from trucks and the same type advance mechanism!. Question - is the distributor clamp different for a car and truck. I wonder if I had a truck distributor clamp then the vacuum advance bracket for the distributor would not interfer with the octane selector(vacuum advance) bracket. But, like you suggest it might be easier to find the car vacuum advance than a distributor clamp. I'll see what I can find. Thanks a million!
Craig