Novice wiring questions

i have a 67 dart. the car was orinally an AC car. the car is a strip car now. i have deleted the wipers, heater and have gone to aftermarket gauges. I am getting ready to put the wiring back in the car. i was hoping to use the factory harness. my main questions are concerning the engine bay wiring. i have a compete MSD ignition system. can i delete all the factory ignition wiring?