I know you can do what you want with your car but..........

Not an A-Body but how much would the value be hurt if you had a real 1970 Charter RT 440 six-pak, 4 speed originally FC7 w/ white stripe and white bench seat interior and changed the color combo to lemon twist yellow with black stripe and interior? I guess I am to much of a purist and had to ask the owner at the car cruise if the car was supposed to be a purple car. I guess he didn't like the fact that I asked but I didn't say who's the dumbass that would change the color on such a rare car?. I asked and tried to talk a little about his car but his answers were short and he wanted nothing to do with my conversation.