pulling heater box?

You don't need to pull the dash to remove the heater assembly. Just remove the mounting nuts on the motor ring under the hood, the heater hoses and there is a hook in the left air box(vent) you will need to unhook. Also there will be cables going to the heater control that will need to be unhooked and duct work.

I agree! You can also take the end of the heater box, cut off the air vent, install a plate or something to hold a flat surface, so you can glass it up nice to make your own vent box. Works great.