Steve - Can't speak to 64.5 cars, but both of the 66 Dearborn cars I owned appear to have started with red oxide and then had a half-assed overspray of black up to the rocker panels. My 66 assembly manual also instructs the workers to spray underhood and undercarriage with black.
Maybe Jeff or Charles can say for sure.
Glenn Morgan: 66 GT V-Burgundy Fastback 351w+toploader+9 in. TracLoc. Started out as a rusted-out Chicago-area crusher. After sacrificing a solid 66 coupe for its sheetmetal sub-assemblies, I have one solid (and expensive) work in progress!
Maybe Jeff or Charles can say for sure.
Glenn Morgan: 66 GT V-Burgundy Fastback 351w+toploader+9 in. TracLoc. Started out as a rusted-out Chicago-area crusher. After sacrificing a solid 66 coupe for its sheetmetal sub-assemblies, I have one solid (and expensive) work in progress!