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I ran 1 of these on a 318 in a 73 B100 with a 450cfm spread bore Holley carb, stock engine with headers and duals. It did exactly as claimed, improved throttle response and fuel economy over the stock 2v and the linkage hooked right up.

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Many years ago, late 70's, I used 1 of those switches to trigger a home brewed water injection setup on a 383 Road Runner that had way too much compression for the available pump gas. It worked really well for that purpose. Since engine vacuum is closely related to load, I'll bet there are...