Head Gasket

I said I have added coolant before. also all the cold exhaust can't come out the left side, the car has true duals. I cleared out the heat riser passages when I replaced the intake gasket the first time. I understand engines make water, but a big puddle under one pipe and nothing under the other is not normal, and my other 3 classic carbureted cars don't make any puddles.
Is the exhaust system equipped with a functioning factory heat riser valve?