I was at 450 RWHP from 2006-2007Your car might drive like shit. But, unless you have a bunch of mods other than the Edelbrock, your peak HP isn't that bad. And variations between dynos might mean you have more or less HP than what would register at another dyno.
450 RWHP is the generally accepted "safe" HP for the stock motor, though I realize many guys are pushing it beyond that. They are not as risk-averse as I am . . . good for them.
500 RWHP FROM 2007-2008 and 543 RWHP FROM 2009 to now.
The car now has nearly 90,000 miles and over 2400 1/4 mile runs.
Best run of 11.139
A proper tune and good supporting mods are essential.