Fuel supply could be an issue. Read your spark plugs. Are they too clean (lean mixture) ? Setup a temporary fuel pressure gage (tape it to the windshield). Do you get a pressure drop when accelerating ? A wide band A/F gage can help, or putting the car on a chassis or hub dyno. I just did the overkill approach with the Tanks INC electric fuel pump setup. Car runs strong now and I will put in on a hub dyno in the spring.
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