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Dang, I'm chasing down a similar issue. I think I have nailed it as too much fuel pressure. The gauge reads 5.5 PSI, but it runs mega-rich at lower RPM, and once I manage to get it revved up, it clears out and will run pretty good, until the RPMs drop.
The car had a dead battery, so I had jumper cables on it. Unhooking the cables caused the fuel pump to quit, and the engine instantly started running better, but not for long. I swapped a good battery into the car, and the idle problem returned, but it would run longer than 30-45 seconds.
It currently doesn't have an FPR. I will be getting one to install, and see if that solves the problem. The FRP I am getting has a boost/vacuum reference port (Mallory 4307M). I plan to try 4 PSI at idle/high vacuum, and see what that does for it. Edelbrock says 6 PSI is recommended, but that may be a bit high for idle/part throttle on these carbs.
This is also a Edelbrock 1405 on a SE 6 port 13B, and RB intake. The carb is practically new, maybe 50 miles total drive time.
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