Rick, I have a 302, still I did change from a 750 dual pumper (4150) to a 650 vaccum sec (4160). The fumes of unburnt fuel is practically gone, my plugs used to foul (dark coulour). Now the cars is a little quieter and almost doesn't smell. The main drawback will be the passing (WOT) will be somewaht weaker than before.
Denis
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