Trying to find any information on my car and 340 engine

I purchased this 69 Swinger 340 in the San Diego area 9 months ago and I was told that the owner passed away a year or two earlier. I was told that he had bought the Dart at a local S California car show of some sort, approximately 4 or 5 years ago and didn’t do much to the car, I am not sure if I was given the truth or total BS.
I have been working on the Dart whenever I can fixing numerous issues and garage restoring what I can do and I’m in my 70’s so I am not fast anymore.
What I would like to find anyone who may have any information about this car.
Originally from the factory it came with a white vinyl top and a white stripe.
I’m sure it was at the track sometime in its life because it has subframe connectors.
Trying to find out anything about the motor, what was done when it was rebuilt.
It is loaded with options including Auto, A/C, PB, PS and much much more.
If anyone has any information on this I will appreciate it.
Thanks

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