Going to the junkyard tomorrow

Last weekend I was at a old junkyard and I found a bunch of parts. I found a orange 340 block laying under a hood. It was half covered up by a 390 engine and I couldn't move either one. I could see the 340 numbers on the side and the cylinders I could see looked ok. The guy wants 50 bucks for the block I figure it is worth that to see if it cracked. I found power door locks on a 72 chevelle (10 bucks a piece) that I need for my gto project. I also found a 69 4 bolt main 427 block laying under a hood (appears to have spun a bearing). I couldn't believe my eyes when I saw the 512 casting #. The cylinders have some surface rust but the guy wants a $100 for it. May be cracked but like the 340 it is worth the money to found out. Weather should be nice hope to have a good day. I may post some pictures if I have time to take any.