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Frank get the sniper and bring it over to Larry at ASSC
You ever read the Cliff Ruggles book? If it's bogging there's a good chance the air door is opening too suddenly and you need more tension on it. I presume you have one or both pull offs still on the carb right?
Just send it out and have it worked on IMO.
Do you have the original dizzy? If so check to see if the weights are moving freely. At WOT vacuum advance should have no impact. If you have a set of aftermarket weights (see below) they seem to be pretty damn lazy on the timing coming in. Otherwise there's not much to go wrong. Usually the springs would lose tension and make timing come in too quick. The air door is probably the big thing it can cause the fuel to go rich and kind of waver.
The other thing is the accelerator pump. If it hasn't been replaced E10 could have ravished it.
Roboto has some good tips, distributor weights are often overlooked. I would also be looking at the jet sizes on the secondary bowls, they may be a size too large and when hitting WOT they dump too much fuel in the mid to low rpm's. Lots of guys did this as the jets needed to be bigger for racing. Gave it a little extra power up top in the rpm's but street driving suffered.