Not sure how accurate this is, but:
http://www.g-body.org/history/b/prod-b.php1987
GNX
547 Produced
276 HP @ 4400 RPM (actual HP rating was closer to 300)
360 ft-lbs of torque at 3000 RPM
- GNX #033, owned by the President of ASC is the only GNX fitted with a ASC-installed astroroof
Grand National (WE2)
20,193 Produced
245 HP @ 4400 RPM
355 ft-lbs of torque at 2000 RPM
Turbo T (WE4)
1,547 Produced
245 HP @ 4400 RPM
355 ft-lbs of torque at 2000 RPM
Regal Limited w/ Turbo
1,035 Produced
245 HP @ 4400 RPM
355 ft-lbs of torque at 2000 RPM
Base Regal w/ Turbo
4,268 Produced
245 HP @ 4400 RPM
355 ft-lbs of torque at 2000 RPM
Total Turbo Cars = 27,590