Newbei 67 Plymouth belvedere 318 2bb dist vac port is timed or full.

4spdragtop said

Look at both ports on carb. 1 should be slightly higher than the other one. More than likely the higher one will be on pass side and that is timed port. The one that is lower is full manifold vacuum.
Any mopars I know that are vac adv hook up to pass side port.

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I agree, the vacuum advance should be on the timed port, as the throttle opens the vacuum increases in that port to advance the timing for better part throttle operation, plugging it in the other port will advance the timing at idle and will retard the timing when the vacuum drops on that port.

Oh! And welcome to FABO!