This is a predicament. My two-cents worth... If it is driving you crazy now, and you can afford to fix it, then go ahead and fix it. Otherwise, it will bug you forever. I too have a 905 red 1970. When I had mine painted, the paint shop told me that they had a PPG representative out to the shop and he used some sort of sensor to analyze they color inside of the door jamb. I did not see them do this and he could have made it all up for all I know, but I am happy with the color. It looks just like the original. People sometimes think I have an orange car. I used to have a 918 orange '71. Now that was orange. I would notice a 240z that was the "wrong" red, but I wouldn't hold it against anyone.