what size fuel line for nitrous setup?

Yeah I think it will be pretty cool. Here are pics of when I first got it. A lot of things were done wrong on it, so I'm making them right, but it was complete except drive train. It won't look like this when done, it will be black and will have different rear spoiler. Not sure yet if keeping the scoop. Just my toy to mess with and make it the way I want it.

Best part is hardly a spec of rust anywhere. Texas car until about 2009 and off the road for over half the time since then.

Wheels on it now are Imperial.