Seems a little slow...

With an auto, you check idle vacuum in first gear, not park.

Again, its a good idea to leak the thing down. If you're not getting good ring seal or whatever, you're not going to make power. poor ring seal can definitely effect engine vacuum.

ITs possible (likely?)that your balancer has spun on the hub. Is it a stock style deal? To half *** it its easy enough to turn the motor over till the mark is lined up on the timing cover and pop a plug to see where the piston is. If its clearly not at TDC you know you've got a problem there.