Arround how much horse power and torque would a 10.6 compresion 454 have with 254 cc camber large oval port heads and a 282 duration 531531 lift hydrolic flat tappet cam?

This is a pretty generic question. Cam timing events play a major role in how well a cam actually performs. Headers vs. manifolds also make a big difference when you start making changes with the cam, as a bigger cam needs to breathe more. Without knowing these things, as well as carb/fuel injector size- a VERY rough guess would be anywhere between 400-475 ft/lbs and 325-400 horsepower. If you have all the matching components to this set-up, you could readily see 500/500..