Original/correct advance springs for old tractor distributors are nearly impossible to find anymore.
The alternative is to go to an on-line hod-rod supplier such as Summit Racing, Jegs, etc., and buy a generic distributor advance kit" or "distributor re-curve kit" containing an assortment of advance springs, use the ones most like the original in strength and length, then verify the advance is operating correctly using a timing light, swapping springs if it advance too early or too late.
Ideally, one would use a "distributor machine" and have an OEM advance curve spec. sheet at hand, but you are dealing with a relatively low RPM low compression engine and in this case "close" is probably good enough, and certainly better than before you worked on the distributor.
Also, there's lots of videos out there from guys "re-curving" distributors and probably some helpful tips, as well.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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