All nuts and bolts on a first generation Camaro are American or English "inch" type. The newer Camaro's hve both "metric" (mm type) and inch type on them.
My own tools consist of both so that I can work on anything!
I have sets of 1/4", 3/8", 1/2" and 3/4" sizes although my 3/4" set is just a cheap set from China. Short and deep well sockets, open and closed or "box-in" wrenches from 1/4" to 1-1/4" and metric equivalent. Adjustable "Crescent Wrenches", all sorts of pliers (slip-joint, channel-loc's and "Vice-grip's" as well as electrical type wire pliers.
Also the usual hammers, chisels and punches, screw-drivers (straight blade, four sided Phillips type and a few "torex" or "star-type"), a 3/8" sized sets of socket type "Allen wrenches" and "Torex wrenches", too.
Please note that my tools are a hodge-podge mixture of good ones like the Craftsman's as well as quality ones of other brands that I have been gathering together since I was 15 years old (now 54).
I still buy a single tool or an odd set of them every chance that I get when I have some extra money b/c I will spend the money anyway and this way I will have something to show for it. You know that they last forever unless they are stolen or lost!!
I buy my tools from retale stores when they go on sale as well as from "neighborhood garage" sales and "flea-market" type sales places and have even bought some from "Pawn-Shops".
I recently aquired some of my father-in-laws tools after he passed away when we lost my Mother-in-law for keep-sakes. I even have a couple of my fathers tools since when I lost him at 14 years old.
I guess what I am trying to say is that building a good set off tools is a lifetime's commitment. And it is generally a GUY'S THING!!
Good luck with your search for your set. pdq67