What are these wires for?

[TommyGuns]

I have an 83 K10 Silverado. A previous owner or the mechanic they hired did a swap from the truck's original 305 to a crate 350. Unfortunately they did not bother to connect the wiring to the A/C, the transmission TCC wiring, and they completely threw out the cruise control assembly. I'm slowly working to restore this stuff, and the next thing I want to tackle is this cut bundle of wires on the passenger side of the firewall above the valve cover: https://imgur.com/a/C4l3f8c

The only wire they left connected from this bundle is what appears to be a ground wire, connected to the back of the engine.

The other wires are:

• A very Light Pink
• Light Green
• White
• Two? Dark Brown wires
• Yellow

As of now, the only things not working in my truck are the A/C compressor, the TCC lockup, and the Cruise Control. The AC blower motor works, as does the vacuum driven A/C vent doors in the cab. Looking at the wiring diagrams are not all that helpful in this case, as they don't specify where on the firewall the "grommet" in each diagram is located. Also several RPO option diagrams share some wire colors passing through the firewall. I hope the location of the grommet will help identify what these wires go to.

Does anyone have any idea what these are for?