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Didn't the A12 cars come with the aluminum intake? I remember seeing 70 and 71 B/E bodies with cast iron intakes but I thought the original 69 6 pak lift off hood B body cars came with aluminum....

Engine vacuum holds the trap door closed - floor it, the vacuum drops, the trap door opens. Now fit - that's another matter...

And check the float set up.....

Check to see that the metering rod lifting mechanism still has the set screws tight. Your rich condition could be due to a misadjustment of that set up with the power piston and the metering rods.

Invert the carb as shown, the top edge of the float should be parallel with the top edge of the bowl. Bend the bent tab that is pushing on the needle valve which ever way it needs to go to get the float level with that edge. In this pic the float appears to be too low. If its too high the car...

The bowl vent is usually open at idle and closes when you open the throttle. The real issue is that the float may be set too high. Either there is junk in the needle and seat or the float level is set too high. Pull the bowl off and invert the bowl. The seam in the float should be parallel with...