MP 528 cam vacuum

850 rpm should be good to idle at. Being it is a 4spd.

I figured what 1W&CG listed as his readings to be what you would get for a high. Unless you installed it oddly, then of course, less. As mentioned,once in gear (As in auto trans equiped cars) idle can drop a bit and with it, vacuum.

I'm glad you have the abilty for power brakes, Often I meet people that claim they can not run them due to low vacuum. (Lord knows what they did)

MRL really hit the head. I was going to mention get a vacuum gauge, but figured from past convo's, you would know that. I'd have to spring for one with performace cams and power Valves. Ya gotta getcha one.

Once you see where the vacuum is at, your power Valve can be adjusted correctly and probably end the weird idle issues your having.