The Intake and single carb base for the Tri-Power system you mention, was actually designed by "Mac" and his team several years earlier for his Cammer Engines".
So the "Single Base" system actually "pre-dates" the mentioned "GM Management "One Carb" rule for Pontiac. And yet, the Chevrolet Guys were allowed to continue to offer the HOLLEY "Tri-Power" on that vehicle.
Someone could very well have said, how about we make a single base "Tri-Power" system like "Mac" did on the "Cammers" but that suggestion probably was swept under the rug quickly. Rochester was gearing up for the Quadrajet Carbs for production and would not want that distraction. They were actually getting rid of Tri-power castings, using 64 and 65 end carb parts on 66 systems.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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