Unfortunately you activated the "flaw the car" device that is located at all state crossing in Texas. This is meant to keep people (from out of state) from taking pristine vehicles to other places for their own personal enjoyment. When you crossed into NM or OK the device was activated and thats why you have all these things wrong with the 300D
Seriously, sounds like you have a very nice 87D with low miles and should make a good keeper. Make a list of the priorities of repair and knock them out as $$ are available and you will enjoy some low cost of ownership for many years
