Glad to hear that it drives!
Get a new thermostat, what you have is broken. The temp should get warm by the first mile and the gauge never moves once it gets to midway. You will need to lower the antifreeze level anyway to get the heater core and lines installed at the firewall.
As to the air flow from the vents, the center vent has a fresh air wheel next to the open close vent wheel. On the 1998, I believe down is closed. If up, raw outside air will blow through the center vent.
The thump, thump above 55mph is probably a flat spot in the garbage tire. Just swap that wheel with the rear wheel and see if it moves the vibration.
Not engaging P consistently is a problem. Broken motor mounts are common at this age, especially the top mount to the firewall and the front mount under the crank at the timing belt.
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Keeping it running is better than buying new
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