underdash retrofit a/c
 

I've found a few posts but nothing helpful. I am looking to install a complete HVAC unit from a newer vehicle. I have seen the current aftermarket kits, but don't want to spend that much. When I bought it, one of those under dash units was installed but I am looking to tuck everything up under the dash. I was thinking HVAC box from maybe a cavalier, neon, or escort. Any thoughts?

68 c-10 custom long box
Non a/c cab.