Hey thats cool Nick. For 1973 the car would have only been able to race as a Sports Sedan, as CAMS had made big changes to touring car racing beginning that season, dropping Series Production and Improved Production, and replacing them with Group C and Sports Sedans. The SS regs had a 6 litre engine limit so the 396 would have been no use anyway. But as the 6 litre rule had been brought in at the end of 1971, it would have raced in 72 with the small block. You have to assume the big block ended up in a drag car or jet boat or something?