Using my A/C cab with non A/C heater box?

[Patsfan34]

My 70 truck came with the A/C setup but I don't want to use that stuff. I haven't pulled the system out of the cab or off the firewall yet. There's a member selling a nice non A/C heater box that's about an hour from me for a good price so I'm just trying to get some answers so I don't hold him up. Assuming the non A/C heater box will bolt right in, is there any reason I shouldn't buy his setup and put it in my truck and then sell my A/C heater box set up complete? Or am I wasting my money and I could just take the stuff I need from my A/C setup now and break it up and use the heater box and blower and sell just the A/C portion of my set up? I hope that made sense!

Thanks, Neil