Here is my home brew unit ready to test but I am waiting till after Saturday because I'm driving to a tech session. This is the cheapest GM module I could find on Ebay so I will verify it does the dwell change. Some info on the internet says some of the cheap modules don't do the dwell change and are not good.
I also ordered a new timing light. My old Sears light died. I wanted to check the timing does not change.