New OEM gas tank for 66 valiant but want 1/2 lines to carb?

at carlisle gastanks.com had sending units in 5 /16 3/8 and 1/2"

IIRC the 2 smaller ones were 60 at the show and the 1/2 was 120

1/2 is overlikk IMO - i'm into the 12's with a stock 5/16 line and 2 holleys on top of tunnel ram... 3/8 would feed that 340 all day long, but its your fuel line.