Haven't done one on the Camaro, but have done several on late Dodge Dakotas and Acura MDX. Most modern cars trap the heater core inside the HVAC box and bury it in/under the dash. Usually means extensive removal and disconnection of dash electricals, A/C, etc., etc., etc.. It is a time consuming and complex deal in most cars- especiall in terms of disconnecting and reconnecting all of the electrical connections without forgetting any.
I'd suggest you get a hold of a Helms manual or access some detailed database and check into the procedure before starting to take things apart. My first Dakota heater core took me 4 days in my driveway. The third one (check the quality of the replacement part carefully before installing it- if it's defective you get to take it right out again! Ask me how I know.) took my son and I just over 4 hours in his shop. Be patient; label things; good luck!
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