Take a tape measure. See if overall length is 48". See if the head is 30" X 9" and has 33 studs. See if it has 12 ports. Chances are it's not that big. Try to locate casting #s and let us know what you find. Here's pictures of mine. Thanks

http://picasaweb.google.com/sixpics/52DodgeBigSix?authkey=BZdrDZ3_kiY#

"I wonder if God created man because he was disappointed in the monkey?" Mark Twain