Got it figured out. It was in a previous post about a year ago, so that helped.

For anyone else that will tackle this sometime:

There are four nuts on studs:
1 is about 2-3 inches from the blower motor on the upper left hand side.

1 is about 1-2 inches from the blower motor on the lower right hand side (the blower motor being the reference point)

1 is directly below the coil

1 is about smack dab in the middle of the firewall behind the valve cover.

All are 7/16ths head nuts. Take the battery stand out of the jeep to reach the nut below the motor. Be sure to remove the condensation weep tube right next to the motor.

How hard would that have been to put in Haynes! <img src="/forums/images/graemlins/confused.gif" alt="" />

Once you figure that out, it is very easy to take the heater box out. Putting it back in is a tad of a challenge, but not that bad. Total time to remove, put in the new heater core, put back in, about 4 hours.