Under hood fire :(

[Dragster66ss]

My 77 sierra classic caught on fire under the hood last night. I'm not sure what started it yet, but leaning towards electrical. Burned most of the wires from the harness, windshield wiper motor, washer fluid container, etc. Got it put out with fire extinguisher. I'll try and get some pics tomorrow.

Here's my question. What are my options as for re-wiring the old girl? Will definitely need complete wiring harness. Is this going to be something very specific, or is there a range of trucks that will fit? How do I tell? Can I simply order a new/repop?

This is definitely not a WTB post,, I'm looking for advice/options of ways to replace the parts and get my truck back running.

Thanks in advance!
Lee Roberson