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I have been fighting for a while now with a poor running stock rebuilt 426 hemi i have.it runs pig rich and has no power.it was rebuilt in 2005-06 to stock specs and the car has basicly sat most of the time since.i have switched out carbs,every single component of the ignition system as well as corrected an incorrect timing mark and replaced the exhaust pushrods that were too long,replaced the ebay rockers with OEM chryslers etc etc.I was working on it tonight and discovered it is only making 5-6 in of vacuum at idle which seems way too low.
Im starting to wonder if it could have an incorrectly degreed cam,an RB cam,or the cam has gone flat.
The engine leak tested perfect(under 15%) and compression is 140psi across the board.

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Check the valve lash, if it has excessive lash on one or two lobes maybe the cam is going flat. More than likely whoever assemble the motor did not degree the cam, they stuck it in and aligned the dots