vacuum gauge to solve idle issue

4spdragtop said

Yes vac gauge is hooked to ported one. The only other port is the one for choke pulloff, which is capped on carb.

Click to expand...

Thats why you're only getting 3' of vacuum on your gauge at idle. Thats the ported (no/very little vac at idle) one. Try hooking the vacuum gauge to the choke pull-off port...it is full time, manifold vacuum, and will give you the correct gauge reading.