I fired my 6v car up yesterday after sitting for months. I had to crank it for a while before fuel got to the carb. It was a little slower than normal, but she didnt quit, and it started up just fine. My system is all oversized and fairly new. I put 6k miles on it last year trouble free. I ran 10g for the headlights with a 6g common ground cable running to the junction block up front. That serves as a ground for everything up front. 40/50 watt headlights are plenty bright. I did it all pretty cheap, mainly because I had a large stock of wire that I aquired years ago and a good gen/VR. If i was starting with nothing, id consider 12v, but im a purist and like to keep things as they were. Conversions are always a spicy topic, end of the day, the only one you need to impress is yourself.