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Most stock LT4 dynos I have seen are in the 290-305 RWHP area. I can't say about the top-speed though, I would assume the factory rated speed is about right though.
Surprisingly, the power of the LT4 varies from engine to engine. There's a site that lists the power output of several different LT4 engines, all stock and I was surprised at how much the power output differs from one engine to another.
If memory serves, the dyno results are posted on Corvetteactioncenter.com
I believe that is true with most performance vehicles-maybe due to tolerances and/or how the car was broken in.
My 87 GN was fast, but other stock GNs would take me by a car length to 80mph so I know it was middle of the road fast.
the 95 6MT is something else- would absolutely crush the GN and possibly take your breath away in the process-don't know what's up with this one-asked previous owner about a year after I bought it "C'mon whad you do to it?" Guess the proof will be in the dyno nums