1976 Ford Ranger rebuilt top end now wont fire up

Electrical problem
1976 Ford Ranger V8 Two Wheel Drive Automatic

I rebuilt the top end of my 460 big block. Only because my head gasket was blown. Well when I got it back together it wouldn't crank. I checked all my fuses, and I checked to see if it was firing I didn't couldn't even get a spark out of the coil wire. The wiring is all original and in pretty sad shape. I want to run new wiring but it has proved impossible to find a wiring diagram for my truck. I checked on a new harness but they were all way out of my budget. Could there be an easier solution to why it wont fire, or do I need to put the project on hold until I find a new harness. It's a 1976 ford ranger xlt supercab long wheel base with the big block 460 engine.