Checklist

Check and flush the cooling system, make sure it is not full of rust. Might work fine for a while, but rust (or just crud) can break loose from the radiator, heater core, thermostat, waterpump and cause leaks, or worse, plug something up. Also the heater hoses can "swell" inward cutting down the flow.

Check the trans fluid to make sure it is not burned, if it is, change it and install a trans cooler. This will take some of the losd off your radiator.

If you have manual steering, make sure the box is tight (nut and screw on top) and make sure the bolts that hold it on the frame are tight (that will make your steering loose and can crack the framerail).

Other than the things already mentioned, throw in some new plugs, wires, coil and battery, maybe voltage regulator and you should be good.