I'm gonna need the pictures, I know how it works, except the part where you say that the spark port keeps pulling harder as the air moves faster, wouldn't this mean that both advance mechanisms are doing the same thing, increasing with rpm?
The spark port pulls a vacuum that is proprtional to the load so it'll pull it's hardest under the least load once the throttle blades are opened. I also have an article in HOT ROD that says the exact thing as the FordMuscle article and I think if it was incorrect, it wouldn't have made it into print.
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