Very interesting car indeed. Just about every color was available in 1970 except for black and most special paint cars I have seen were painted that color.
Notice the trim tag is missing the stripe color code as well. Very cool.
Since it's a Norwood car I highly doubt he will find a build sheet in the car. This would be the one to do a previous owner trace on to see if any of them have the paperwork for the car.
Somebody obviously repainted and added a few things to the car. The Z/28 emblem in the grill is wrong. It's a Rally Sport so no emblem should be there.
I wish I didn't have a driveway full of cars, I would jump on this one.
Rick H.