450HP at the wheels......or at the crank (engine).
Either way.....just putting in a stroker crank won't do it. You Will Need a full compliment of supporting mods to take advantage of the stroker:
Pistons (whether you bore the cylinders or not!)
Heads/Cam/Valvetrain NOTE....cam spec's should be optimally matched to static compression ratio, head flow and engine displacement
Spark Plugs & Wires
Then.....once you have all that wonderful power, you'll find that your power curve (specifically TORQUE) has shifted to the right (towards the higher RPM range), so you'll need:
Torque Converter.......in order to compensate for that.
Then.....the weak link (transmission) should be beefed up because a 15 year-old stocker likely won't last very long with the power you throw at it.
EDIT: And as a side note; it's possible to get 450HP from the engine without stroking it.....but you better have quality parts in all the areas I mentioned above.....and you really should devoir and digest what Lance posted in the thread that I linked!!