'79 Ford Ignition Help

[MED]

My father gave me his 1979 Lincoln Mark V Collector's Series; it is has 1571 original miles on it. Typical Ford of this era, I am having problems with the ignition. The engine is basically new and original to what it was when it rolled off the assembly line. There is a weak spark (visual spark intensity inspection) to all eight cylinders; it fires and runs but fouls all eight plugs in about 30 minutes or so of running. The goofy ignition module was replaced once about 15 years ago. I tried a different coil. The plug wires, cap and rotor are all new but I inspected them. I am kind of at a loss with this one. Any Ford guys have any ideas?

Edit: It looks like there is an ignition voltage regulator. I guess I will try to find this guy.