Vacuum connections

Where are the vacuum connections on the intake manifold on the 3.4 engine

On the back of the inlet manifold and a small pipe from the front carb to the distributor.

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But on a SP head the manifolds have one at the middle of the underside. ( 240/340/420)

Look for vacuum leaks along any of these lines. You could easily be leaning out your engine if there is a leak.