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The skinny O2 sensor only came on redtops. It sounds like a redtop from 91-92 that somebody installed a type-x harness and ECU on. The skinny O2 sensor will not work with the J4 ecu iirc. You need to run the typical fat O2 sensor for best results.
That could very well be the issue regarding your fuel economy. Two things you need to do next are:
1. Boost leak checks (do this often) Fill the plumbing with about 15psi of air pressure and check for leaks. This is the #1 most often overlooked issue with these engines.
2. Get a normal size O2 sensor wired in properly. use the J4 diagram (I made one a while back, just google "62 to J4" and it should show up) to wire the signal wire to the ECU. Do not worry about the other wires right from the start- JUST wire the signal wire. Once you see the sensor voltage working (flipping) if you do not know what that means ask. THEN wire up the O2 heater.
O2 sensors only need 1 wire connected to work. Even if they have 1, 2, 3, or 4 wires- Its just ONE signal wire to work. In fact, you can goto pep boys, and buy ANY $12 1-wire oxygen sensor from the shelf and it will work fine.
Finally,
a. your idle vacuum is normal. That is healthy valvetrain to pull that vacuum. If you just got the engine make sure you do a compression test, and WRITE DOWN the results. Compare with those results after about 5,000 miles. You may want to run some de-carbonizing fuel additive through it a few times. Or some distilled water through a very tiny nozzle over the course of a few thousand miles.
b. change the pcv valve, they are easy to change and cheap
c. get a brand new set of cheap NGK plugs for the engine with a 7 heat range, that you will install ONLY after you fix your rich running problem. For now, disconnect the oxygen sensor until you get that sorted out.
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