New Guy

Hello, I am restoring a 1972 340 Duster (auto on the floor) and have a some questions for all the Mopar folks. This car is a matching number car as far as I know and I do have documentation. Although I'm having trouble finding the stamped ID number on the motor. I think I have found where it is but I can't really make out the numbers. Also, the car is in the body shop right now and I am wondering what to do with the color. It is the gold metallic color GY8 and has never been repainted until now. So here my main question, would this car be worth more with the same gold color since its a matching number car or should I paint it a more desirable color??