Inliners International Forums General Discussion Drive Train 292 brake booster vac port?

I had a '62 292 in my '74 GMC 3500, but the carb was the original '74 single barrel and it had a tube directly in the bottom rear of the carb about the size of the gas line that hooked directly to the brake vac hose with a check valve. It needs to get full manifold vac. A lot of the small ports on later carbs are regulated for various smog purposes and not suitable for vac brakes. You could just tap into the intake if there is no tap with a plug already. Just don't let any thread shavings get into the engine.