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Just connect a vacumn gauge to the carb where there is vacumn at idle--stock cam -engine in good shape should pull 18-21 inches of vavumn. Even if you have only 12-18" still should be enough to operate bosster. Here is a way to check your booster-shut off engine-press down on brake petal and hold-start engine-if booster is working petal will go down slightly.
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56 Chevy Bel-Air 2dr. HT (purchased new)
71 Chevy Cheyenne SWB PU (502HO)
65 GMC short bed step--work in progress and my gofer
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