I have a 1969 gtv shell and a 1971 gtv which I am taking all the parts from(that were the same from the 71 and the 69)and putting all the parts into the 69. However, the engine that was in the 71 was replaced and is a 2000 engine instead of a 1750 like it should be. If I were to put this engine into the 69 would it decrease the overall value of the car? Also does painting a gtv not the original color decrease the value as well? Any help is appreciated, thank you!