No, you can't use an Impco mixer with this type of regulator because the J&S regulator presents pressurized fuel vapor to the J&S mixer.
Then the J&S mixer meters the low pressure fuel into the intake system.
The Impco regulators DO NOT feed fuel out under PRESSURE.
The Impco system only lets fuel out of the regulator when a negative pressure (vacuum) pulls against the secondary diaphragm in the regulator with enough force to operate the secondary fuel vapor valve.
When that valve unseats, fuel vapor rushes toward the mixer, and away we go.
This is why it was suggested early in the thread to scrap the J&S in favor of Impco components........the 2 brands are incompatible, because they work on different principles.
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