383 deal?

Found this on CL (http://jacksonville.craigslist.org/pts/3153715015.html) Seems like an excellent deal. Is this an oddball engine or something? Is this a good deal? Don't know this engine, but want to put a V8 in my A-body.

It was on FABO back in April. Even more pictures than on Craigslist.

http://www.forabodiesonly.com/mopar/showthread.php?t=185826