To go orig. colors, or not to go orig. colors. That is the question

So as some of you know, I just picked up an all orig. 340 4spd dart sport with less than 80k orig miles. I will also be getting some unique dealer paperwork with the car and I am trying to decide to go orig colors or not. It is that nasty yellow, cream color with a green houndstooth interior. Had no stripes and nothing flashy with the exception of tips. It's a manual steering, non A/C car but does have power brakes and a fold down rear seat. It is a numbers matching, un modified car. All the body work and paint will be done this winter.

I plan to drive the car and enjoy it for the first little wile, but then will probably sell it. My question is, do I paint it original or a different factory color? Do I put headers and my LD340 intake on it or leave it stock? what will get me the most in the end?

I am thinking of switching it to black houndstooth interior and not 100% on exterior color yet.