66 barracuda
too bad you are so far away...I have a 273 that I have no idea what to do with. It won a best stock engine last year and it was the engine i used up until I got a wild hair and decided to match the vin code by putting a slant six in it. I had the trannie too but I gave it to Fort Dodge Transmissions. The best place I've found as far as finding hard-to-find peices is Texas Acres.
I looked on the net for your casting number and can't find it. Here is a link that has a list of mopar casting numbers if that helps any.
http://www.mymopar.com/enginecastnumb.htm