Stupid Distributor Questions

Well, I thought it was better last night, but I was wrong. :(
I took the car for a long ride this am, and it still has a stumble, and will pop through the intake when put under load. If my foot is to the floor, the car runs like a bear! I put the 93 octane fuel in it this morning and the ping is gone. If the car is cruising on level ground, you can barely feel this misfire, or stumble, but once you get to a hill and the 727 is in 3rd gear, or if you accelerate slightly from cruise speed, the car will start to buck as the load increases, and eventually will pop through the intake every 10 seconds or so until either you nail it, or take the load from the engine. I dunno if there is a vacuum leak somewhere or not. If it is idling, it is smooth as silk, and the engine will die if I cover the carb with my hand. If you rev it up in neutral it is smooth and powerful, but once there is a load on it, it will start to stumble and run rough, unless it is at wide open throttle.

I thought I had this licked last night, but I only took it around the block a few times so I guess it wasn't really long enough a ride to make it act up.

There are only 5 vacuum ports that I am aware of; one on the intake for the brake booster, one for the PCV valve, and one small port at the base of the carb in front. The other 2 are as follows; one for the vacuum advance, and one to operate the choke pull off. I currently have the port for the vacuum advance plugged at the carb.
The power brake booster will hold vacuum, and so does the choke pull off. The intake has never been removed from the engine, and all the bolts are tight. The carb nuts are tight as well. I used one thin gasket under the carb, but I have tried it with the thick gasket as well with the same results.

Ironically, my friend owns a 65 Corvette convertible with a 425HP 396 motor, 4 speed Muncie, factory sidepipes, and he is bringing his car to me on Saturday so I can diagnose his engine troubles. At the same time, I cannot figure out what is wrong with my Mopar! LOL I thought it was funny that I am trusted and respected enough within the Corvette community enough so that this fellow is going to drive an hour to my house so I can fix his Vette, but when it comes to Mopar's I am the one who needs help! I didn't think these vehicles would be so different......maybe they're not, and I am just having a brain fart.
Anyway, it's all good. Today is a day to give thanks, so thats what we'll do. I think I'll take a break from the car for today, and help my pretty wife get dinner ready for our guests. I just wanted to THANK all of you guys that have contributed to this thread, and thanks also for those who haven't posted, but wished well.

George