Yes for some reason for 69 and 70 PPG listed the exterior low gloss (used for the 69 Mach I and and Boss exterior details) in with the interior color. For interior "black" the dark charcoal listed was the color used for 67-up
They also list the lower door is not spelled out in the 70 sheet.
So in an effort to help out here is a picture or two of the detail of how it was painted then masked. Posting Dearborn examples though not sure if that is where your car was assembled (From the 0F151xxx period
I've also used TCP Global for interior paints in the past and been happy with the results