Sorry, Joe. Running the OEM Motorcraft carb, you're definitely in the minority among Pantera/Mustang drivers. In fact, there are few shops that even recognize the Motorcraft, stock parts or work on them at all. Of the 140+ Panteras in the Nor-Cal POCA chapter, only one runs the Motorcraft. Your symptoms point to fuel problems, either starvation or momentarily rich due to float bowl overflow into the throttles. About all you can do is play with float heights to mimimize the effect, or avoid the situation. Or change to a more mainstream carb...
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