Yup ... I'd start with connecting the vacuum line directly to MANIFOLD vacuum.Some Modulators are adjustable, small screw inside tube where Hose connects. It will give a small 3-5mph range.
For more adjustment you'll need a Governor Recalibration Kit.
B&M Governor Recalibration Kits 20248 - SummitRacing.com
Modulator needs Full Manifold Vac, not Ported/Timed Vac source.
Really? There are NO provisions on that intake?I have to drill a hole on the single plane intake. That means I have to remove it?
Not necessarily. "Manifold" vacuum only means a full-time vacuum source that is there even at idle. "Ported" vacuum is NOT there at idle, and that's the main difference between the two (there are subtle differences besides that, but they do not apply here).I have to drill a hole on the single plane intake. That means I have to remove it?