1968 Dart GTS LS23H8 383 4 speed car

I am sorry for the loss of a friend and hope you find a good home for his car. I can definitely see a labor of love maintaining originality and adding some personal nuance to the car. I think all completely understood what you were saying in your description of the car.
There are casting numbers on the radiator and exhaust manifolds that are specific to vehicle/engine and hard to get. I would add them to the post or the information you have. Also a picture of the fender tag would be helpful, you can blackout the last 3 of VIN if needed.

This is the registry link. A thought also is this person may know someone looking/ request for one as well. So I would get it added or updated if there already. It might help with the sale.
http://gtsregistry67-68.com/