You speak as if you were a partsman at one time... SO true.
A little background:
I actually was born at the end of the musclecar era, but have been involved shade-tree style since the late 80's and have been fortunate enough to be in the business directly for almost 9 years. I'm at a dealer who was once involved DEEPLY in performance, restoration, pro-shop, and mail-order parts-almost 25% of business, and about that in inventory as well. We once held a show in our shop, and had guests Warren and Kurt Johnson both there. We mocked up a '69 Camaro on a drive-on hoist (plywood covering the open hole, and laid out pretty much all the sheet metal, bumpers, chrome, crate engine/transmission, etc for everyone to see what we stocked. I remember stocking ZL-1 (NOS too!) pistons, rods, and cams. Wish I would have bought them and hung onto them now!!!
We had the first few ZZ430 engines available to the public, and sold 10 total. We had our own crate engine program, being one of the few who took 502 MARINE engines, and made them into 509s. Got 609+ hp, using iron heads, and readily available parts. Sold them for less than $9,000.
I also have been fortunate enough to work with the traveling GM Performance Parts, GM Restoration Parts, and Chevy Racing displays when they come to my area. Go to park my buddie's car in the display area to help promote GM stuff.
The performance and restoration business is just too competitive to keep a sustained profit, unless that is all you do. Factor in the the extra overtime on weekends and additional inventory dollars necessary to make it worthwhile, and profit for a large show like Car Craft Summer Cruise would net us about 6-8% profit once labor for manning the area (plus pre and post show set up, tear down, and loading/unloading from the shop), purchase costs, space rental, table/tent misc show fees, and then using the space at the shop for inventory storage. We needed to have $$$ for "real" parts, so we bailed. We still do a little resto sheetmetal business, but don't actively promote it like we used to. It's also too costly for people outside our area to have it shipped without potential damage. When we got out of the pro-shop business, we donated over $25,000 to toys for tots-2 complete truckloads of die-cast cars!
Your local dealer also probably doesn't have the necessary reference materials anymore ither. We only have 1976-2007 GMs loaded into the computer, and from the mid-80s back, the catalog isn't that great. We still have to refer to the old paper catalogs for 1975-older, and there's one for every manufacture, plus special lines like truck, vette, corvair, etc. I have managed to keep for myself as much as I can find at shows and swap meets just for personal use.
Long story short-if your dealer sucks, try to find another-even if it's a little drive. A Chevy dealer is probably your best choice just because of the probability of having the old books.
Thanks to everyone here for having a good site that promotes Camaros in a positive way-be it restoration or customs. I was directed here by the other "TC" site-Team Chevelle, where I'm also Bowtie-72. Another great reference site.