CSX3021 above started life as blue. (S/C)
The
oil pan was changed by Mr Turner and it too was stock
oil pan in blue trim.
My best guess was either as many things in those days were slightly random and definitive on one is cloudy on others.
289's were black
Comp cars I worked with have been black
S/C low miles blue, before complete resto....
Many 3200 cars blue.....
Remember most restored cars are changed and many not even concours contenders as things fall off, get changed or even fall into the whims of owners preference...
