I love the looks of your Demon as is, and the history of the car.
Personally, I would leave it as is and enjoy it.
There's too many people worried about the resale value of a car versus the history and fun factor these cars have if left alone.
But, as always, it's your car and your money.
Do whatever pleases you...
Thanks! Yes the car will never be for sale, so that isn't as important. My boy will get the car some day and hopefully he will do as he wishes with it as well.