Dynojet dynoes will automatically stop recording once the HP starts to decline. Any "smart" dyno operator will know to NOT continue pushing the engine once the power peaks.
I haven't dynoed mine yet, but it will probably happen in January. Desktop Dyno says it should be about 350hp, 380 ft/lbs from my little 360. I expect to see around 270-290 at the tires with around 300 ft/lbs.
It will do until I build my 500hp, 349 stroker.