Yep, that's definately off. The formula for hp follows:
hp=torque * rpm / 5252
With a peak torque of 221.8 ft-lbs, even if we assume a perfectly flat torque curve all the way to redline, you'd have the following hp numbers:
221.8 * 6662 / 5252 = 281 hp
221.8 * 7000 / 5252 = 295 hp
So, that's only 281 hp @ your claimed rpm given the peak torque. Even at redline and assuming peak torque, that's still only 295 hp. I'm not saying which is right or wrong, but they definately don't match up.