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If you like the car, just restore it back to original. If you want an "upgrade", sell it and buy a later model original car.
+1 all the way!
IMHO, you are just making the process of resoring that car so much worse for the next owner of you're not interested in doing it yourself. You should be able to trade 1:1 for a newer car, at least considering the $ it will take you to do a "upgrade" that will just lower the value of your current ride.