I take my 26 inch craftsman tool box with all my box wrenches, ratchet wrenches, screw drivers, some type of persuasion(I have a small sleg) mechanics gloves, and my craftsman 160 piece socket set, that's on a normal visit, just in case I see some thing I want for later on.
in short take what ever you can
the boneyard here has wheel barrows, and all the cars are held up on the frame with 4 sets of 2 rims welded together with the wheels already off. most places I've heard of have all the cars divided into they're company makes (ford, gm, mopar, and import)
if your looking for posi trac they are already gone, limited slip are easier to find, but when I was hunting I couldn't find anything higher than 3.73, but then again where I live has a lot of people looking for parts for drag cars on the cheap(I guess they aren't in it to win it)
that's the basic's, good hunting.
1970 mustang 302, lunati cam, HEI distributor, edelbrock performer 289 intake, edelbrock 1407 carb
1998 mustang gt 4.6, CAI, thrush welded, 2 12's and 1000 watts