I voted, from your choices, that you should paint it Hemi Orange.
The burnt orange exterior is too close to an "earth tone" if it doesnt have a perfect clearcoat and polish job on it.
the burnt orange interior is a toss up.
its a 1970 year only option, and not terribly common.... so supply is low, but then so is demand.... because an orange interior doesnt sound all that swell. It grows on you though. I refer to it as basketball-orange.
Burnt orange dash pieces and various non reprod pieces are far and few between on ebay, but there usually isnt much competition for them once they show up. Instead of mod-ing my original center console for the manual shift tranny, I got a second one off of ebay and I got it cheap and in great condition, same with kickpanels and a right side driver dash piece.
being that Im in AZ, the orange is better than black.
and white is hard to keep clean... and green (to me) is ....