Being that the only Tri power optioned vehicle in 1967 was the 427 Corvette, adding a Tri power to an original or restored car will not increase its value. Unless the person is truly looking for that on their motor. If I remember correctly, Royal Pontiac, conducted some testing running at Motor City Dragway, using a 1967 GTO with a Q jet and then swapping a 1966 Tri power unit and it showed no appreciable improvement. The Q jet has proven itself to be a pretty good carburetor for making power.
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