Good advice. There are no junk yards around here, though. Ebay is really my only source for used parts. And I'm reluctant to buy used electronic parts on ebay, since I can't inspect and test them first (of course, I don't mind gambling a couple of dollars on an old part, but I don't like spending $30 for a decades-old used electrical part that could easily be broken or worn out.
This is just for fun, so why not aim high? I want to see if I can make an ignition booster out of new parts, for about $20 or $25. The way I figure it, if I had to spend more than $25 on parts for this experimental homemade booster, I would be better off buying a new Dyna Ignition Booster for $68!
So, here's my plan. I just bought a new Ford module on ebay ($3, plus $3 shipping, made in USA by Borg Warner, part number CBE20). It's the same as the one I posted about in post #20 above, but a little cheaper). When it arrives, I will see if it works.