fuel pressure

Recently completed a new sbc 383 engine build. The builder recommends 1/2" fuel lines. My carburetor calls for 6 psi. What size fuel lines are fuel pump psi ratings based on? I know a bigger line will decrease the pressure, so I need to find one rated for 6 psi on a 1/2" line.

Holley 3310-2 Runs really well at idle (13" plus vacuum) but pulls fuel in a big way on full throttle AND deceleration. Engine smokes like start up after flooding. 72/80 jets. 6.5 PV. Its so rich the pipes turn black in 1 hour and may be causing high oil consumption????????? Where could the...