IDK if that's the best advice.
There are quad fan radiator set-ups available, there pricey and would require a upgraded alternator and maybe dual batteries to run properly(that's just my 2cent).
Try using the existing e-fan, or add one. Use a adjustable fan thermostat to turn the fan on when the engine thermostat opens.
I'm using a fan thermostat w/ the probe "t'd" into the engine thermostat housing set to turn on when the engine thermostat opens.
You'll need more than two electric fans to cool a high mileage xj though.
And make it run well below 210, although it suppose to run at 210 hmmmmmm