It's hard to tell the condition of the paint from the pictures you posted, but if it's still real nice I wouldn't change it.
If you were going to paint the car anyway, that would be another story.
If you like the Mayfair Maize, and are painting the car, then go for it.
I stayed with the original Aleutian Blue and teal interior when I had my car painted, but opted to leave the teal vinyl top off.
I love the blue with the teal interior, (luckily blue is my favorite color) but not a fan of vinyl tops. My feeling was that I saved the trim pieces and it could always be added.
Putting the original color on the car might make it worth a couple of bucks more on resale, but for me personally it would have to be a color I liked.
I didn't buy or do my car for the next guy. I've had it for about 17 years, and unless something changes, it will be my kids selling it when I'm gone.
But if you plan on selling the car anytime soon, you may want to factor that in to the decision.
Mayfair Maize isn't my top choice of colors, but it might look really nice with the top and interior.
A friend of mine just bought a Carousel Red 69 convertible. I'll probably be stoned for saying this here, but Carousel Red is not on my list of favorite colors either. I remember when the 69's were new, and although I loved GTO's even back then, I didn't care for the Carousel Red color from the first time I saw it.
My friend's car has the parchment interior and white top. I have to admit that although I was never a fan of the color, it really looks fantastic in that combination.
Having grown up in NYC, I think every Carousel Red 69 I had ever seen back then had black interior. The lighter interior really changed my mind about the color more than 4 decades later, and the white top really sets it off.