Non-A/C Heater Box

360scamp said
........and I picked up a nonAC heater that came with the chunk of the firewall that the blower motor sticks out of and the guy told me that I would have to cut out and weld in the firewall chunk in order for it to fit.

Oh no....this is what I was afraid of. Loks like me gonna "modify" my exsisting A/C box into a non A/C box and NOT weld the firewall.

Any other suggestions?