I use -8 an stainless steel braided line from the tank to the regulator in the engine compartment. This is on a big block 67 Camaro. The kit came with a 20 ft. roll of fuel line with all the fittings. You can use this 1/2 aluminum tubing without investing a fortune in a new fuel line.
Summit Racing® Aluminum Fuel Lines SUM-G2512 - SummitRacing.com