challenger heater box non a/c

I know this is not the e-body but I don't really want to sign up at FEBO ......but I have a 73 dodge challenger that I gave to my dad and it was an A/c car but we want to change it over to non a/c now that the firewall is stripped and before the car goes to paint.

I have the A/c box that will come out of the to trade if anyone is interested in A/C ....if not, I am looking for a decent NON A/C heater box for a 73 dodge challenger.