Fuel Line for 2.8 engine

i have 83 chevy s-10 2.8 v6 i was wondering does anybody know what size fuel line goes to carb. Im thinking either 3/8 or 5/16. Thanks i have Haynes Manual but it says nothing about fuel line.

It's probably a metric. They're forcing us to go gradually to all metric.

Thanks Joe i will check it out Bob