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Re: driveabilty problem
First thing to check would probably be the fuel filter also a good idea to check the total advance and make sure it's not above around 38 degrees at 3000 rpm. If you don't have access to a dial back to zero timing light just unhook the vacuum advance and cap the port on the carb and drive it to see if it's better. Also look it over for vacuum leaks. If it doesn't change check the valve adjustment and make sure it doesn't have any tight valves. I had a problem with a 454 doing something similar and it was due to two valves being tight...not tight enough to be a problem at low rpm but seemingly tight enough to cause cylinders to drop at about 2800-3000 rpm range. It's hard to diagnose a problem via pc but these are things I would check first along with anything I might have missed suggested by other members. Hope you get it figured out.
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