Is my engine low on vacuum????????????? Help?????

Well, the link to that cam in Summit didn't tell Me any more than You provided, but the math in my head says 61deg overlap and My gut says they want it installed @106deg.
That's not a candidate for a good idle vac @800rpm. As already stated above, getting the initial timing up to best vacuum in tandem with the correct throttle blade opening
will maximize what You've got, but without knowing where the cam is installed................just FYI, I've seen 340's w/the 292/.508, a 6pak, and less than 10:1 idling ~1K &
they pulled 9" there..........................