Paint or Natural

Picking up rear end parts from stripper tomorrow.

67 Dart, 273, 8 3/4

Paint or Natural?

Housing - paint - semi gloss black
Center section - natural
Backing plates - paint - black phosphate
U bolts - natural
Shock plates - paint -semi gloss black
Pinion snubber - natural
Drive shaft - natural
Drive shaft yoke - natural
Pinion yoke - natural
Nuts and washers - paint black phosphate

Most of my deductions above were based on if the part was rusty or not, but many of the parts were bought seperatly so I don't know if many of the painted parts were originally natural. The ones with a ? After them I'm on the fence based on versions factors. Right now I'm just priming, so it will be:
black = paint
grey = natural

So what say you!