Allan, Use the .020 for a distributor; .013 is for a mag. I've given up on the hassle of setting timing on my 6V + gnd H with my 12V - gnd timing light and spare battery kit -- so anymore I just do it by ear. Turn the distributor for the fastest idle, then back it off a tad. Take it out and run it, checking for pings or abnormal heating, and back off as needed. Actually, until you get that 50+ year old distributor fixed up with new bushings, gears, shims, etc. it's going to have enough slop to defeat your best efforts with a timing light. If you do have a bullet proof distributor, take the pulley and degree it off in 5's with a Mr. Gasket cam timing wheel -- then you can see if it likes 25, 30, 32.5, 28.5, etc. degrees of total advance the best. While you're at it, get an old M&W PTO dyno and measure it down to that last ft/lb and last crank degree and make an art form out of it - you've got today, Friday and the weekend to have fun.
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