Building a new Wiring Harness

[cebra]

I had a lot of issues, mainly a underhood ground of a hot wire that caused a small fire and melted the power wire through the fuse box and to the lights/ignition. With that said I am making a new harness for a LS swap, VSS, etc. I will post pics when I am done. Fuse Panel is from a 1992 Blazer.

Anyways, I may need some help along the way. First, I am converting my AC harness to heater only as I have none of the Ac stuff. Does a non-heat truck only use the resistor then out to blower and no blower relay like the AC system does? Also, does anyone know if Vintage Air uses the original AC harness if you get the “with factory AC” kit? Don’t wanna hack it up if the Vintage Air Kit uses all the existing AC harness. Thanks.