I would say that checking the injector pattern might be a good thing to do as well as comparing the flow one to each other.
The common fuel filter is KL145. But I guess you already found out.
For an unknown maintenance record I would:
-acquire a cable for TuneECU
and download it
-Check the valves (shims are easy to change on the gen1)
-balance the throttle
-seek a gas analyzer and adjust the idle CO using TuneECU
-clean and lube the rear hub. Maybe change the bearings
-clean and lube the suspension linkages. Maybe change the bearings if needed
-check the fuel fitting and change them for metal one if needed
-change the brake fluid
-change the coolant after rinsing the circuit
-As pushr0d mentioned, double check the IACV hoses for cracks and change them for silicon one if needed
I wouldn't swear it but I think your IACV should be the same as the gen 2, that is affixed to the air box.
As said the body or the "ears" may fracture. So it should be checked as well.