Just my opinion, but I think that's close. Mine picks up about that on a 300 hit, but a lot has changed from it's best NA pass. It's slower NA than it used to be by a couple tenths. The nitrous will need a tighter converter and less gear.
At the 500 hp level I'd definitely be getting a nitrous specific camshaft. Seems like 300 hp is kind of the ballpark for needing a different cam. I'm still running the same cam in mine that I built it with in 2006. Not a "nitrous" cam, but it does pretty good.