I'd grab some of the breakable/hard to find plastic items such as the thermo valves from the intakes (if they're not already broken), latches for the side windows, maybe some switches from the dash (turn signal stalk if it's not too difficult to get out), flasher relays, fusible links? Basically a bunch of incidental stuff that won't take up too much storage space, but you'll be glad to have the spares should the need arise (or to sell to people! *cough* window latch *cough*). Check if any have manual hubs and grab those too. I use to always grab fuses, bulbs, little crap no one thinks of until it breaks off in your hand and you think "crap...where am I gonna get one of these?" (and most junk yards could care less about plastic - two heaping handfuls of doodads usually costs $2-$3 bucks, if they charge you at all)