Running rich is showing low vacuum. There probably isnt a vacuum leak, a vacuum leak will make it run leaner. I would blame the problem on 2 things. 1, bad injector(s) that could be hanging open or 2, bad mass air. When my motor was first together, there was a trick flow cam in it. I than swapped in a huge .603 lift cam that was custom ground for a stroked 351, than went in a f303 cam and then went back to the trick flow cam. I had the same problem that you are having, it was running pig rich. Wouldnt idle right, had low vacuum, i put new injectors in with no change, spent many hours looking for vacuum leaks, took timing cover off to check to make sure gear drive gears were good, put every new sensor in except for one, a mass air. Put a new mass air in a everything was solved.
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