Tuning a DD 383 for optimum mileage / 1/4 mile performance

GRANCUDA said

What is PVCR?
Power Valve? I have it sized by 1/2 of my idle vacuum.

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That is calibrating the timing of the enrichment, not sizing, the number of the valve has -0- to do with the amount of enrichment.
What temp thermostat are You running?