She's got a small block and now she has problems. Help

[screwball]

So I'm in need of some help. I have gone and foolishly forced a small block in to my 89 mighty max. Apon doing so I no longer needed any existing wiring in the engine bay. All of that has been removed with the exception of the starter soilinoid wire . Now when I roll the key to start I got noting. To add to the fun I have some gauges that run off of keyed 12v that do not get and power until I put the key in the start position. I have also removed the factory gauge cluster. I have a sneaking suspicion that I have created some communication issues by doing so. Does anyone have some insight as to the wiring in my truck? Little back story I am far from the only person to have gone at this truck with tools, I have fixed a lot on my way and still have more to do. I started this project years ago and could not continue so it got pushed to the way back burner, now that I'm back in it trying to finish I am finding the problems. Any help would be very appropriated