Have you looked at the oil on the dipstick?
Overheating a 4.0l can have painful results.
But engine should still start, just run rough, if a head gasket has failed or head has cracked.
The starting fluid should fire that engine up if spark is happening at the correct time, so if you can, I would try a timing light on #1.
Lower rad hose steam could have damaged the CKP(crank position sensor), long shot but it does control the spark.
It can be tested with a meter set to AC Volts, when crank is turning CKP's two wires should show .3-1.2vAC, it generates its own voltage.
You don't need a scan tool for the '94 OBD I, if it has a Check Engine Light then you can use that and count the flashes.
Read here
http://www.therangerstation.com/tech_library/OBD_I.html
Malfunction Indicator Lamp (MIL) Method
Oh, and if you want to see if the head gasket or head was effected by the over heating there is an easy test that can be done without a running engine.
Get a latex glove and rubber band.
Assuming cooling system is sealed now, no leaks.
Remove rad cap and over flow hose
Place glove over rad cap opening and use rubber band to seal it tight.
I pull a vacuum cap from the intake to seal the over flow opening, but you can use your finger if you have someone who can crank the engine, so seal the over flow opening.
Turn over engine, if glove starts to dance, inflate a bit, then you have a head gasket leak or a cracked head.
If glove doesn't move then you are good.