Thanks Toolmanmike, I will look into adjusting. I just set the timing to TDC as the book says. The car runs well, it just shows a low VAC. Everything else is a NO, unless the purple DC cam already has it added in.
You have the car timed at TDC as in 0* ignition timing?
No wonder it has low vacuum. I've never had a mopar, let alone one with a bit of camshaft that liked anything less than 10-12* BTDC for ignition timing.
If your car is a stick, you can turn up the idle a bit as well after setting the timing to a better vacuum signal.