Doesn't Langdon sell this sort of stuff already setup for a stovebolt? Just a bolt-in?
One question about vacuum advance: A 450 GMC dump truck that was in a fleet I took care of had a 270 (or maybe a 302, don't remember) did not have a vacuum advance at all, only mechanical. I always figured it was because it was pretty much a binary operation -- idle or foot to the floor. Even with a 5spd OD and 2 spd axle It was not fast and used a LOT of gas.
At times when the vacuum advance on my pickup has failed I found it overheated the exhaust manifold and burnt the gaskets out. One time was an inconvenient repair in Boulder, Utah. But NAPA had the gaskets and the advance unit. Why didn't the big GMC behave similarly? Apparently it's not always needed. My pickup runs flat out much, but not all, of the time. It uses a lot of gas too. Pickup sits out in the yard and there are 5 motorcycles in the shop. Suppose that has anything to do with gas as $5.59. Ethanol-free is only 10% more. I recommend it for all the motorcycles. They don't always listen. That's why I've done so many carburetors lately. It's the pilot jets, stupid. It's the pilot jets.
Gad! Topic drift all in one post. Sorry, I'll promise to be more on point from now on.
