What's interesting about the "it won't rev because of the cam timing" hypothesis is......modern cars with VVT can move the cams around 50 degrees.......and they rev just fine.

I agree the 90psi cranking pressure needs looking into.

I thought the vacuum reading test was a check for plugged catalytic converters(or other exhaust restrictions).

I'll be interested to see what's found when the timing cover is removed.

If the cam is retarded 2.5 teeth(35 deg) as someone mentioned, I would think there's a good possibility of some bent exhaust valves.