Another option with the Holley is having timing control which will help with idle quality as well. There are no "vacuum limits" with the Holley systems as they can be tuned to run a hybrid of Alpha-N to Speed Density.
The Avenger EFI which uses the handheld controller does have some tuning limitations built in "on purpose" which doesn't access those types of tunes through normal mapping. In such a cases....just break out the laptop and go through the standard software.
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Dennis
Moore Racecraft
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