I am placing a big block in my 69, and can't find frame mounts. They are discontinued through GM and every Camaro place I have called are out of the right hand side. The part number is 3980942. The same goes for 68 mounts, except the opposite mount is not available. Can I use one 69 and one 68 side, and I am running headers, and a solid motor mount on the drivers side. I needed these mounts yesterday! I am very well convinced that I don't want to use the small block frame mounts. HELP ME!!!!!!