We recently had one of these built for our shop. What a great tool!  This jig effectively locates all of the First Gen Camaro mounting points so that your rusty first gen goes back together the correct way. We looked at some others on the market, but frankly, this is the best one we could find,and yet is reasonably priced.

Give Joe a call at First Gen Jigs. Here is a link to their site: www.firstgenjigs.com