1967 Belvedere 1 start

I have the same issue with my 67 Belvedere wagon. I need to do something about a right rear quarter that on a wagon has the spare tire well. The bottom of the tire well rusted and a previous owner slapped some fiberglass and body filler over it. As for my suggestion for a color for yours, I would suggest medium tan metallic or medium copper metallic. Both are great looking 1967 colors and neither are dark colors. The medium copper is a one year only color. As for my wagon. it has blue interior, so I will either keep it white or go with a midnight blue metallic. Since I have a white 68 Barracuda and a white 66 Sport Fury, I really don't want to keep the wagon white.
The Belvedere I sedan in the photo is medium tan metallic. The GTX is medium copper metallic (the sedan and the GTX are cars I photographed at Chrysler Carlisle). Don't mix up the medium copper metallic with turbine bronze which was also available in 67. Turbine bronze was darker and had a reddish tint to it. And don't think the medium tan metallic is the same as gold. The gold in 67 had more of a yellowish tint while there is no mistaking the medium tan for a brownish tan color.
Kind of hope you stay away from the non metallic beige (more commonly known as "Old Man Tan").