Thanks again fellas. Here is the issue. The car was running flawlessly and there was no kind of smoke at all from the exhaust. The morning I started it to go out for a test drive it started running bad and huffing black smoke from the exhaust. It apparently suddenly developed an over rich condition that was bad enough to foul the plugs in a matter of minutes. Hmmmmm. I changed the pressure regulator and threw a new set of plugs in. Same problem. I ran out of time before I could really get into diagnosing the problem. I'm working in the afternoon tomorrow so I'm going to the shop in the morning and pull the hood and air cleaners off and take a look in the carbs while it's running.
The intake manifold that I have is basically designed so that one carb feeds two cylinders each and all eight plugs were equally fouled, so I doubt that all the carbs went south at once. I think that something may have went bad in the ignition or I have too much back pressure in the baffles that I installed in the pipes. I think it's either one of those or too much fuel pressure to all four carbs. Maybe a combination. I'll know more tomorrow and will report back in.
