Managed to get a few hours in on it.
1. You guys were spot on about the aftermarket cruise control. It took me about 2 hours to completely remove it all, but that is what it was. Removing that fixed a lot of the junk wiring. That was also the reason for the extra long speedo cable. There was an additional section of speedo cable in the middle that had the cruise sensor. Also got rid of the extra vacuum tubing it was using and throttle switch, etc.
2. Pulled the radiator since it was leaking. Once I got it out I could see that it wasn't salvageable. Might as well buy a v8 radiator now since I need to get one for later.
3. Since I had the radiator out, I pulled the AC condenser out to trash it and got rid of the AC compressor. The AC compressor didn't have the belt on it so it hasn't been used for some time.
4. Started to investigate some of the wiring under the dash and behind the radio. Cleaned up some of it, but didn't resolve my main electrical issue. I do not have wipers, washer, horn, turn signals, dome light, or blower motor. Once I got rid of the cruise control junk I didn't see anything obviously wrong. The fuse box looks pretty sparse, but don't see anything overall really missing. I pulled all the fuses and none looked obviously blown, but haven't checked with a meter. Any good starting points to try?