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Throttle body mods won't help much until you complete other mods first, like cam, exhaust, and intake. Once you do those, a 52mm is about right but still, don't expect a lot from the throttle body. Ported intake will help much more. I can't say for sure on the camaro intake, but I'd think any lt1 to lt1 or lt4 to lt4 intake would be interchangable except one from the smaller 265 engine. An lt1 intake will not interchange with an lt4 intake.
I've read a thread asking about the compatability here before, and there were some opinions that some fittings were moved around, but I'm not sure if was between different LT1 years, or it was diffs between the f-body and y-body.