Interesting Electrical Probem

[Rem701]

I have a 71 GMC Jimmy that is located in Austin, TX. I keep it in a garage full time with the top off. I am out of town during the week so typically only run it on the weekends. I tried to run it on the weekend of January 28th and it seemed like there was no power to the fuse block at all. Lights did not work, would not start, radio had not power with the key on etc. I looked at the fuse block and I have what I believe is the electric choke lead, which is non factory, for the edelbrock 1406 plugged into one of the two ignition unfused plugs, that wire was unplugged for some reason. I also have another lead plugged into the second plug next to that one, which was also unplugged, I am not sure what it is for but I think it is factory. I think it is possible that i could have some how kicked these wires out of place. The reason I brought up the date was because that particular weekend the weather was unusually humid, so much so that there was moisture on the windshield. I have been keeping the vehicle in its current location since September and I have never seen that happen. I was not in town last weekend, so I did not mess with it then. During last week Austin had some crazy freezing rain weather that caused city wide power outages. It never moved. Last night, Friday, I came into town and tried to start it up. All of the electrical system worked like it always had. The lights came on with the switch, the engine turned over, and the radio behaved like the battery was disconnected and reconnected. Then engine took a little bit of time to start but just like it has been. The only thing was I think the chock was open because once I got it started it ran at pretty low RPMs. Then I ran it for a little while and everything seemed fine except for the oil pressure gauge was slightly erratic, which I have never noticed before. I drove it today, Saturday, and when I started it, the chock did seem to be engaged because it was running pretty fast. I let it run for a few minutes like that and then hit the accelerator to make it stop. I then drove it a few miles stopped, picked up some food, and then got back in it and everything was still fine. Sorry for being so long winded but I guess my question is, what can cause total lack of power to the fuse block, and then start working again? Would the moisture cause any of this? Is this related to grounds? Any incite would be appreciated. Thanks in advance.