I have recently picked up a 91 hatch/AOD with 144k mi. and after driving it for a couple weeks and looking it over here is the work I put into mine. Some items needed to be replaced, others you just normally do when you buy a used car.
Where to begin...I'll start at the rear.
Drain and fill on the rear end...wow 3.27s in there!
Upper axle-side bushings
Rear brake shoes
Tranny fluid and filter
Water pump
P/S Pump
FMS hose kit
Serpintine belt
Cap/Rotor/Plugs
Oil Change
Flushed radiator (really good)
Master cylinder
Flushed brake fluid
Front swaybar bushings
Front Struts / Topend strut bushings
FMS C-Springs (was optional, didn't need it)
Cleaned IAC and MAF
TPS Sensor
Replaced all A/C hoses and Accumulator/Charged with 134a
Air Filter
Canister purge valve (only code the cpu was throwing!)
Iginition switch
New tires
Cleaned, cleaned, everything in and out
I think that's about it. After doing all the above I considered it a mechanically sound daily driver.
--Matt