Thanks for the feedback.
Had to run for a few parts this morning and came back to button up the brake hoses from the vacuum pump to the booster. At this elevation & air density, the pump maxes out about -18 inches as shown on the gauge here. I was going to mount a small gauge up on the cowl vent but decided against that look for now, and installed a gauge on the vacuum can instead. It's been sitting here for an hour w/o any bleed down so all appears well with making some decent stopping power given the fact the cam is a bit large for a power brakes application. I think this pump will have helped the cause.
