Sounds about right.
I had managed to peak mine a lot over 300 and 0-60 would be mid-high fours easily (when it wouldn't misfire!)
Not a lot more, once you hit redline in sixth, that's it. The gearing defines your limit then. But the more power you've got, the quicker you hit this limit.
cavalier in drag is not totally off the mark:p
Beware, the CallyT feels faster than the supra, but it isn't necessarily faster in real life. I've got lots of measurements for both. 0-60 the boosted CallyT is quicker, and feels quicker too.
60-100 may be another story, even if it still feels quicker.
Over 100 the supraTT wins hands down, even if the Cally feels fast.
Of course braking, handling and suspension of the Supra is on a different level. Body stiffness too.
Once you do 160 on a Supra or a Skyline, then you have to ditch the Calibra, it feels like a bad joke.
If you've been in a Corsa LET, then that's the feeling you get at high speeds: flimsy, unstable, noisy, one-trick pony.