heater box removal

cudaman 51. ok please tell me more. if im hearing you correct(i see the bolt between) im not looking to drop the heater box out from under the dash. i can take it out in 2 pices? if so, which bolts unhook the box from the firewall. looks like the one in the pic is a mounting screw, and there are 2 more, one behind the distribitor and one toward the upper side of the firewall. the 3 that hold the blower motor seem to only hold the blower motor. pretend i dont know dodge from ford and tell me how to take out the box (readers digest version) tks