In the late-70s the Porsche's were moved from Sports Sedans into Production Sports Cars, when they Australian Sportscar Championship moved to these regs.
In 1982 when the Sports Sedan Championship became a GT Championship (and the ASCC was run for Group A Sportscars, not production sportscars) they were allowed to compete as they were classed as GT cars. Circa-1986 the GT racing went back to being Sports Sedan racing (though there was no national title)
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