Vacuum reading help.

I'll definitely be checking the valve lash first - may be a few days away right now though.

C130 Chief - The electronic ignition upgrade is not intended to be a fix to this problem, just something I had planned on doing at some point. And I'll be using a Mopar distributor from a later slant, using the HEI kit here.
The reason I mention it is in case point dwell being is being effected by temperature - that possibility will soon be eliminated.

Thanks everyone for all the feedback, I'll check back once I set the valve lash.....