[rolling money pits]

unfortunately i cannot give you what youre asking for, a "hook this colored wire to this gizmo etc." deal.

what i can tell you is you can leave every last bit of wiring, the AC subharnesses, in place and achieve your goal. the AC subharnesses are a 2 or 3 piece deal, going from the alternator, compressor, and control head. everything revolving around the climate control electrical functions are spliced in to that.

since the AC is "gone", specifically the compressor, there will be ends/connectors that will be loose, hooked to nothing. You'll need the main power feed ( if it's still this way on a 79 F-body as it is on a 69 A-body like mine ) hooked up to the alternator, round connector to the + post. The connector for the compressor clutch hangs loose, as would the superheat or thermal limiter switch that's usually on the rear of it. The ambient temp switch - maybe on the top of the cowl on the passenger side, can remain hooked up, it wont be doing anything since the compressor is gone. The loose ends can simply be taped up, then wrapped back "into" the harness lead they came from.

all you need is a wiring diagram, not an electrical engineering degree, to make it all work. if youre not colorblind, you can just "follow the leads" so you know what's needed and what's not.

in doing all this you retain full control of the blower motor, including high speed. it also allows for you, should you choose to down the road, to put the AC back in without having a hacked up harness to fix and/or replace.