I know a lot of guys may disagree, but since I street drive my car EVERY DAY I kept the old wiring and run a one wire alternator but keep the other wires and plugs tucked back near the valve cover, because if the alternator ever goes bad I wanted to be able to get one fast and not have to searxh all over for a one wire one in a pinch. There are a lot of wires that could be removed. As for the heatqer if you re not using a heater then you can get rid of them, I mean its not the worst thing, they are really easy to remove without cutting them so if you ever want to go back you can. Like I said I have a daily driver so I try to keep things as close to universal as I can haha
-Josh