The manual throttle was often used to bring the revs up when operating PTO equipment. My 69 K20 has one, but it is on the left side of the dash bezel below the headlight switch.
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1970 Blazer with a 400 sbc and 4" lift
1980 Pontiac Trans Am, 455 Oldsmobile
2012 Kawasaki Concours 14
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