jegs has the pan w/oil pump, hooker super comp 460 foxbody headers, you can also get a pan/headers, along with motor plates or mounts (they have both) and all kinds of other stuff from D&D auto specs @
http://www.mspmall.com/ddautospec/swapkits.html
also, try-
www.kaufmannproducts.com
I'm not sure if the regular style motor mounts would bolt up to a tube stup, but with a 514 I wouldn't mess with the smaller mounts, they'll either break or put too much stress on the block itself. The plates would definitely be the better way to go. What kind of trans are you going to use? I looked into a number of combos, a lot of people use th C-6, I was gonna use a 4-speed toploader from david kee toploaders. You may be able to use a tremec, but you will have to find a company that makes a bellhousuing/flywheel. If I end up dropping my big block in I'll probably go with a tremec TKO II.