IIRC the pre 1996 EP82 engine has a coolant port on the back of the head, the later engines don't have this port.
In actual fact here's what to look for, found a pic Texx posted ages back, if you just make sure the one you are buying matches your current head it should be fine:
If you use the other type than what you have make sure you get the intake manifold and it's gasket. That'll keep you safe.