Brush-painted orange plug wire supports are very common on original '69-up Corvette L-46 (350/350) and LT-1 (350/370) engines, with various colors of lifting brackets (silver, natural, orange) in no particular pattern, and '63-'67 Corvette engines with aluminum intakes and valve covers had the area on the heads between the intake and the valve covers (that was covered by the plastic mask in the paint booth) sprayed silver/aluminum, which frequently included the intake manifold bolt heads.