Those 7" "boosters" are a ****ing bad joke.
Not sure on the fitment of Highports; my thought is if you are running those forget vacuum boost and go either hydro or manual.
I am running manual on my Lemans and Trans Am - works well, lotta room, cheap and simple. The Leman is a testbed for a 1974-80 1/2 ton truck master; shuld know in a day or to on pedal pressure.
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