Picking up a 400 for 75 bucks!

I'm running down there tonight to pick it up. It was just running a week ago but it lost oil pressure and he pulled it. I figure that even if the bores are wasted, for that price I can have it sleeved. :read2: The guys a Ramcharger freak like I am (he has 5 of them).

Anything I should look for to be sure it's a 400 and not a 383? The guy said that the oil filter is in the front. I don't know beans about big blocks and need some identification help.

Thanks!

Edit: Found a casting number list here.... http://www.yearone.com/updatedsinglepages/id_info/mopar/mopar casting numbers/castingnumbers.html