I had the opportunity to buy one years ago and for some reason never did, can't remember if it had sold or what. I looked maybe that same day at a Mercury Cougar XR7 with the 5.0 HO motor, but it was stalling out with a bad rack or something. For the money I probably should have bought it.
Anyways I love your black one in particular, great looking car on the level of the Biarritz of the same year. Did they still have the touchscreen stuff in 1990?
My first Regal had the same shifter and at one point a problem with starting. Once I got back from the mechanic and they did something whether accidental or otherwise where the mechanism was removed that stops it from shifting unless the ignition is in the ON position. I wonder if you're having some issue with that mechanism? I believe there is no mechanism that holds it from shifting unless the brake is applied, correct?