Guys, thanks for all the info and comments, yes I am getting a little overboard, but do an advanced search on "cotter pins" on V8 Buick and you will find it interesting. Copper was used on 70/72 center link assemblies and they even address the bending them. 68/9 cars used steel and no info on 64/7 that I could find. Per Duane, they do take points of like at BCA National events. Thanks Bill.