like Faz says, if its been taken care of its a very good (maybe a little thristy) motor...
these are some of tha main things ya might wanna ask of tha PO... still have tha oil injection?.. idle module, detonation module?.. still on it and working?.. last time a "pump kit" (water pump) was done?.. compression test done?.. injectors cleaned and tested?.. any records of anything that's been done?..
are you gonna be able ta "water test?"... keep in mind its a 25 year old motor...
there's lots more still runnin' than one's that are broken in some fashion..... jmo