CBMax - Whether your happy or not really depends on what you intend to do with the car/motor. For street use, primarily, the engine is most likely ideal - very similiar to TC's combo. For the track (road racing) you'll be longing for more as your experience with the car increases but then again you can never have enough so that might happen anyhow.
If those numbers are at the flywheel I'd even say they seem a little lower than stock - I could be wrong but "real world" estimates of standard 427's were between 460-480 hp and low 500's on torque - just a basis of comparison.
I'd side with most others who suggested breaking the engine in, getting to know your car and it's characteristics, and then deciding on updates/upgrades all around. Sounds like a very nice combo you - enjoy it and be safe!