A QUICK QUESTION ABOUT MANIFOLD VACUUM

CFD244 said
No dial back timing light.

Timing tape?

CFD244 said
I just found it strange that the mv is perfectly stable at idle, and gets a little erratic in the fast idle zone.

It's spinning at 1700 with no load, a lot of timing and somewhat lean mix. Maybe if you had a load on it it would be slightly trailer hitching or even reving and dying. Run an engine too lean at light to moderate load and you'll know what I'm trying to describe.

MOPAROFFICIAL said
Should be 13 something or so at idle and richer at throttle.

I agree. Idealy. But a little richer will seem smoother as long as the plugs aren't fouling.
It seems like more timing than needed for the AFR and rpm given the cam and the vacuum reading.

Here's two data logs off my 340 showing rpm vs. AFR when opening the throttles very slowly.
One is in neutral and the other driving the car.

Mattax said
... a couple logs showing slowly increasing rpm with small throttle opening.

The AFR gets leaner with increasing rpm, but only when there is load.