----I know that in 1964 GTO's with tri-power the outside carbs were vacuum operated so it stands to reason that earlier Tri-power cars were also vacuum operated. Progressive linkage was out there in speed shops and guys rapidly yanked the vacuum system off. It was gone on my 64 GP and I never put vacuum back on as the car ran fine without it. I believe that Pontiac saw the light in 65 as 65 GTO's came with progressive linkage. California Chris could proably explain it better than me.....Bill S
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