Well #1 I'd have to say those are good, solid numbers for no tuning. #2, You'd be hard pressed to see much more than a true 300rwhp with your combo. That would equate to about 360hp at the crank. That's more like what I'd expect to see on a Holley intake combo.
Having everything tuned right can result in some pretty impressive running engines, but if I were you, I'd be more than happy with 300rwhp when all it tuned and taken care of. The TFS TW cars seem to produce the max power around 5000rpms from the few dyno runs I've seen/heard about.
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