Cool find. I didn't even know there was a 421 bathtub intake. That is kind of wild. I bet the original ones are rare and expensive.
From what I'm reading they are both , the guys buying the repop this guy made weren't even blinking at his guesstimate of 2500-3000 repop. He is selling the first run at 2500 which fits the 61-64 pontiac head. The one your guy brought in may be the one he had made to fit the 65 and later head ... water crossover is the difference. ... they even have the pontiac part number on them to so they can be used in certain racing classes . The original intake has dual quads AND a 3 bolt flange 2bbl car in the middle , progressive linkage so on the street at low speed you are running on the 2bbl ... that is nuts .
