It appears you're staying "stock" except going to 12 volts but caution .... if you add devices in the future don't overload the ignition switch. My ignition feeder wire between the circuit breaker and ignition switch UNKNOWINGLY melted due to excess loads on the switch. True the circuit breaker should have tripped but it didn't. Ford/Dealers offered optional heaters and typically connected them to the ignition switch. Guess that worked okay but it could max its feeder capacity.
Adding modern devices create a problem. Directional signals and a Tach seem okay as they are low-amp draw. But avoid connecting fuel pumps, overdrive solenoids, electric wiper motors, radios, radiator fans etc to the ignition. I installed an ignition circuit relay, activated by the ignition switch, to handle such items. Granted these kinds of alterations take a stock car further away from its origins, but for me I gain much comfort in the safety gained.
