The heads were the "A3" heads, the blocks were the second (and final) batch of racing blocks cast in Australia. They may have "ordered" 1500 blocks, but there was a high rejection rate from the casting run, due to cylinder wall thickness issues. Nothing near that number were actually placed into inventory.
Notice there is no mention of the existence of the Motorsport/SVO program. That's a very early news blurb. Getting Ford back into racing (Ford Motorsports) and back into producing specialty performance cars for the street (Ford SVO) was one of the accomplishments of Philip Caldwell, the fellow who took over the helm of Ford after Henry Ford II stepped down (circa 1980). The race parts were inventoried via the racing program, i.e. Ford Motorsports.
1982 was the final year of production of the tall deck 351M & 400 in the US. It was also the final year of passenger cars equipped with the 302C & 351C in Australia. Cleveland engines were produced in Australia for other applications through 1984 (those other applications include fleet vehicles, marine applications, and stationary applications).