d.fens
+1y
75174-LCZ 1973-86 Chevy truck Evaporator Kit with factory air - includes all the stuff to move the blower box under the dash.
Did a quick price check, the kit above lists for ~ $600, you might be able to find it for less.
I'm all about this one too, looks like it'll clean up the engine bay and might work better than the OE setup. Win / win situation.