Contact “Bigslant6fan” over on slant six dot org. He makes reproduction Mopar governor springs and provides a chart outlining each spring combination advance parameters. I got a set from him a few years ago, and they enabled easy recurve of my distributor.
Well i guess one cant get mopar springs any more..i wrote a emaail to a vender and got one back saying none in stock and mopar no longer supplys them..any ideas..I will try over on /6..