1986 se wont start no power to starter, fuel pump, or fp relay NEED HELP!!!

ive got an 86 se that i got cheap as a project i dont know wats wrong so its hard to fix. i put power to the car and turn it over and nothing happens no whirr from the fuel pump or clicks from the relay.. im almost 100% sure its some stupid lil wire thats disconnected somewhere from the previous owner who said the car has had an engine swap. i need help bad i need this car runnin asap ne help would be awesome
thanx
connor

I would start by checking for power to the ignition switch since this ultimately controls the starter, pcm, engine controls, and the fuel pump.

Check for blown fuses. If PO did swap only he knows what is what. You can spend lots of time checking out all the wiring issues.