I've got a '83 318/904 Mirada, it stands out 'cause there aren't many atound here. The only downer to them is if your quarter panel extensions are busted up there aren't many replacement options for them that I know of. These guys http://www.vfnfiberglass.com/site.htm makes a complete rear fiberglass clip for them, but I don't have any idea how it fits. They're fairly easy to put a big-block in. This article tells about a big-block Diplomat swap, but it'll work in a J or F-body as well. http://www.dippy.org/forum2/index.php/topic,173.0.html Oops, just found out this link will only take you to the forum homepage, but if you'll click on the fourth topic down (The Library) then on Engines: Swaps: Big Block Swaps it'll get you there.