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I assume this is the 5.0l stroked. If the engine is running too rich, the first thing to check is the fuel pressure, if it's too high due to a kink in the fuel line, it could be causing a too rich fuel mixture because the little bit of time the fuel injector is open, the high fuel pressure would be forcing too much gasoline into the engine. It should not be over 45 psi. I'll see what I can find out about adjusting the tps.
The tps reading on a voltmeter should be 0.39 at idle or 0.20 if it has a mass air flow sensor, then 4.84 at wide open throttle.
Here is the section for the tps, although I don't see an actual adjustment and didn't you say, "but no adjustment with the TPS", so if the readings aren't correct, I suppose you will need a new tps.