Need Help finding/figuring out half dead fuse box problem

I will take a look at all the ideas that you folks have suggested. Yes it does have the dreaded seat belt interlock and I will take care of that first. Unfortunately this car has been hacked to death. Previous owners weren't very kind to it. I have found several wire nuts under the dash holding wires together. Stuff used for house wiring. Started out as a 340 car and now has a 440. Was an A/C car but someone hacked all that stuff out also.