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Thanks for the reply.
They use the probes in the tail pipe and run it on the dyno.
How should i lean out the mixture?

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Do you suspect the cam is still stock? How wild is it? That's the biggest cause of higher emissions. If it is fairly mild, you may be suprised to pass the test since you only have to pass '68 standards (I'd imagine). My stock 318 passed with no problems in nevada. After I swapped the cam, intake and headers, I couldn't pass it.

You would lean out the mixture on the edelbrock carb by turning the idle mixture screws clockwise, as well as changing the metering rods to a thicker rod.

My best suggestion is to hook the vacuum advance back up, and running it on the test. Get a copy of the readings IF you don't pass..and we can look at those and see what the engine is doing. (too rich, lean, etc).