Thanks again VERY much for your efforts!
I have not reconnected the tubes between the air cleaner and the carb (too much effort when the carbs have been coming off 20 times a day!).
I have been spraying just a small shot of starting fluid into each carb before trying to fire her up, and I have not heard anything that sounds like any kind of ignition. So, perhaps it is a spark issue afterall - but interesting since I'm seeing a spark, don't you think?
I appreciate the offer to contact you directly (and may take you up on it down the line), but I hate to bother you on a Sunday, and it's beer thirty, so I think I'm going to call it a day and start grilling and drinking beer. Thanks so much for your help! It sounds like the next step will need to be walking backwards through the electric system and checking everything out. I'll check the points as well, as you suggested.