Russell, you can search my name and check my threads. I had a car that sat for 20 years and wasn't in the best of locations.
Things to throw away were far and few in my experience. Things I chucked were mostly rubber related - brake calipers (core charge for new ones), brake lines, rubber fuel lines, clutch line, rad and heater hoses, spark plugs, tires, all the rust that fell off, battery, battery cables, and windshield wiper rubbers. Items like the floor mats were trashed because one had a cat expire on it (rusted through the floor eventuially as the car sat outside for several years).
The fuel pump was trash and the fuel tank was filled with rust and had holes.
Other than that I was pleasantly surprised as to how many items were still servicable