"Pedantic langauge alert" The first V8 Supercar built would be DJ's unraced EB or Glenn's '92 Bathurst EB as stated earlier, but the question was, which is the oldest, not which was built first.
The fact that some V8 supercars started life as Group A VN Commodores does not change the fact that they are V8 Supercars now and are of course older than the two Falcons which were the first cars built as V8 Supercars.
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