1974 Duster - First Mopar

put power to the car for the first time since installing this engine and new wiring harness. Radio started blaring and open door alarm was humming but I couldnt get the car to turn over so I could set number 1 cylinder to stab the dist. Was getting late so not sure what was causing this. If someone has an idea please let me know. The only thing I changed in the harness was a circuit that went from the reverse light on the manual trans (2 prong instead of 3) Im grounded to the engine with my battery ground (may go back and clean the body strap) Im gonna make sure the starters getting power figure it could be a bad ignition switch.