what size fuel line

i got a fullsize that i am putting a carb. 350 in what size fuel line do i need to run from a cell and what kind of pump is everyone using thanks

3/8 line and im using a 6 psi elect. pump from holley works great one thing i did was put in a shut off switch so the pump wouldnt run if the truck wasnt running i put the switch on the oil pump so if there wasnt any oil pressure no fuel so my key could be on at a show