for example - is your car a 350 or 396? CA emissions or not? some parts change mid-production - so when your car was built will matter...
to answer your specifics - assuming a SS350 - your air cleaner will depend on how your pcv setup is - but it will have a chrome lid (part of the SS option) - my pcv goes from back of block to carb - so I don't have a hose to the breather.. I've also seen a hose from the back of the block to the air cleaner on cars where the pcv was from the oil fill tube to carb.
again assuming 350 - you will have chrome valve covers with no holes - and "chevrolet" written in script across them (again SS option)
there are many many other details to consider (interesting topic alone is pulley setup)
I'd start with the big items first - for drivetrain parts - I like Chevrolet by the Numbers -
for how things are arranged and some part #'s - assembly manual
service & overhaul manual are handy as is fisher body manual.
get a copy of the brochures available advertising Camaro's - owners manual is some help.
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