Engine and trans of course
Crossmember for other projects?
Drums, backing plates and other brake hardware for upgrades.
Interior parts, Seat Belts?, door hardware, handles, Dash parts, instrument lights, glove box parts, etc...
Lamp connectors and wiring parts.
Lots of different fasteners, bolts, cage nuts etc... save them all!
Frame parts, fuel & brake line clips etc...
Start at the left front and go all the way around, in, under and over the car looking at all the little bits and pieces - remove and mark as you go. (if you mark everything you will remember what it is, where it came from and know where to get one next time you need it).
I have been amazed at the parts I've found to use later on my cars and trucks.
Lastly - let us all know what you found that you knew you could use, good info for us all!