Flint V-8 used the same vacuum-formed plastic spray mask on the '67-'68 Z/28 that they used on the '63-'67 Corvette engines with high-rise aluminum intakes and bypass water pumps; I have lots of photos of untouched original Corvettes with varying degrees of orange overspray on the fittings, hose, and clamps. In NCRS Corvette judging, judges expect to see at least some level of overspray, although the deduction is very minor if none is present.