The two ruler method for 42 - 48 distributors is well known; it can be found on the Van Pelt website here:
http://www.vanpeltsales.com/FH_web/f...str-timing.htm
But the same method for 32 - 36 and 37 - 41 appears not to exist. So using a Harmon Collins adapter I made some measurements and drawings to generate instructions for these earlier distributors. I should note here that this assumes that the above instructions are accurate and that my measurements of the adapter are also accurate. And that the timing of the distributors over the years is basically the same if you take into account the the different spacing of the bolt holes. The only way to verify this would be to set up an engine with a degree wheel etc. That said, this method should be "in the ball park".
Here are pictures of the H&C adapter; front and back:
And for reference, the 42 - 48 method: