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John, did you ever get this problem resolved?
I've had the same situation with my T-bird, I'm running the old Holley t-pot carb's on a 2-4 intake, I think the problem In my situation is the floats bouncing around, goes lean then rich. It happens on speed bumps and dips like yours.
Right now I've got all the parts gathered and going to change cam, intake, carb, throw out bearing and a leaky rack & pinion over the winter.
The cam I've got in it right now is a pretty radical grind from Holman Moody and I'm going back in with an Isky RPM 300, hopefully this will move the power band down in a useable range and I'll be putting an Edelbrock 600 cfm vacuum secondary carb to help get rid of the gas station smell when I park it and improve driveability and hopefully the mileage will improve also.
I saw your bird on another post, that's a beauty.
I started a thread about showing off your t-birds, you should definately put up a couple pictures of yours there.
Richard (hotrod55bird)
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