Vacuum Mystery ?

TT5.9mag said

Maybe you have another source of incoming air. Like an intake manifold gasket leak, or a carb base gasket. That would explain why you have no draw on the other valve cover.

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Good points. Last night I spray around the intake while idling....no response. Then, did same on carb base.....got a slight response in the front. Found out the bolts were barely tight. I tightened to 200 inch pounds. However, no change at the air breather (pass. side)......what the ? Should I change out the gasket just in case?