87 sbc 4x4

Well guys, as a mechanic there's only one topic that makes me lose it and that's electrical wiring. So I bought a 88 sbc single cab long bed 4x4 and I'm not getting any power to anything. I did for a few mins then nothing at all. I have checked all fuses, went ahead and did the big 3 up grade because a system will be going in this truck a little later down the road. I have not tested anything else. Can y'all help me from losing my mind on something so simple lol.
Thanks in advance