Unfortunately that doesn't do you a whole lot of good if your original springs are shot, and you are trying to save money by scavenging springs from a different application.
You don't have the original springs to measure the advance curve.
I'm with Owen on this. I sincerely doubt that the advance curve has ever been published for these distributors.
In the past, I've read that you could buy a set of GM advance springs that had three different sets of springs for tuning. You'd use one of the sets, I can't remember which, and it would be a perfect fit...
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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