New to me "90 #442. Anybody familiar with it?

[TX '90 ZR1]

I purchased this car about 3 weeks ago. I am out in the middle of nowhere, so with some help from this forum & the registry I went over the car with a fine tooth comb to verify it was what it is supposed to be. Also, I had one just like this in 1990, so was somewhat familiar even though it had been awhile.
Short history of the car as I have been able to figure out. This is from what little history I have found & also visiting with the previous owner.
Car was originally shipped to Chevy dealer in Lewisville, TX. Dealer transferred to Dealer in Las Vegas, NV where a gentleman from southern CA purchased the car. The car has federal emissions, so it looks like it was driven somehow until 1993 and accumulate enough miles to get it titled in CA. CA emission check records show the car had some miles put on it regularly over the years. Car currently has 34,000 miles.
Car was owned by the first owner & then his estate until Sept 2014 when a gentleman in west central Texas purchased it. Car had 32,000 miles when he bought it. He traded it in on a new (or newer) Z06 at a small Chevy dealership which is where I located the car.
My challenge is trying to reconstruct some type of service history. I have found that the car was at the Chevy dealer in Ventura, CA April 2014. Car was diagnosed as needing injectors replaced, but the customer refused the repair. Car was also at an AC repair facility in Van Nuys, CA July 2014 and diagnosed as needing upgrade to R-134. Again the customer refused the repairs.
It appears someone did both the injectors and AC upgrade in the summer of 2014 before the car was sold. The previous owner confirms they had been done when he picked up the car. Previous owner took car to Henderson in New Braunfels, TX August 2016 because of an engine miss. Henderson replaced all 4 coil units, plenum gaskets, PVC connector & AC switch. I assume they would have checked everything under the plenum while they were in there.
I've put about 500 miles on car including a trip of 250 miles. Everything is as expected except for a few things I noticed when inspecting the car.
They are: Radio not working. Dr. Don says tuner/receiver. Not fun to get out!!
Small oil leak. Not cooler hoses. Not sending units. Will need to trace from underneath.
Seat lumbar pumps not working. Haven't checked this yet.
Everything else is great.

If anyone knows anything about this car would love to hear. Any comments welcome.
Pics coming in following post.
Thanks guys,