Don't have a tach but I can hook up my external. I can probably lower it some but not a whole lot without potentially stalling the motor when it's in gear at a stoplight.
Running 87. I can try going up.
I've moved the vac advance from the metered to the intake port. I can go back. I prefer it on the intake, though, because the trans shifts better on the metered port. I can always add a T if needed.
