what size fuel line for nitrous setup?

I'm not installing nitrous on my car yet, but when I install the fuel cell and braided hose/AN fittings, I want to make sure I use the appropriate size to install nitrous later.

I know a little about nitrous, but don't want to go all out learning everything right now, because I'll forget most of it by the time I get around to installing it later :)

Car would be a small block Mopar, and I'll probably only use a 100 shot.

I see most fuel cells (at least most that I'm looking at) come with -8 AN outlet, but that seems way overkill to me, isn't it?

Should I go with -6 braided line from cell to pump then to carb, or is even -4 (or ?) big enough for my application?

Also, after answering that, if I go to a big block with a larger shot later, would whatever is recommended still be big enough?

Any recommendations very welcome... thanks!