I read this in the April edition of Motor Trend.
"Apparently prompted by competition in the form of the Grand Marquis-based Mercury Marauder, General Motors has approved importation of a version of the Australian-market Holden Commodore SS as the next Impala SS. The rear-drive sedan features a Corvette-spec (350-hp) Gen III 5.7L alloy V-8, six-speed manual gearbox, ABS, limited-slip differential, and 17in. 235/45 V-rated tires. This would seem to doom plans for an SS based on the current U.S.-market front-drive Impala---but that hardly weems like much of a loss."
As quoted from Motor Trend, page 28.