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I'd go -6 feed and -4 return. On my old drag car I ran -10 feed and -6 return, that setup was supposedly good for over 1000HP including a hard dragstrip launch. On a 911 the only time you'll see G's like those is during hard braking which means the pumps have to push against the negative G's of the car to reach the carbs but since you're never under full throttle during heavy braking it shouldn't matter. Have you considered aluminum tubing with AN fittings for the tunnel? It's way cheaper than running braided through the tunnel and is commonly used on a lot of race cars for fuel line. For -6 you'll need 3/8" and -4 is 1/4"
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Email me about 911 exhaust stud repair tools, [email protected]
1966 912 converted to 3.0 and IROC body SOLD unfortunately 
1986 Ford F350 Crew Cab 7.3 IDI diesel, Banks Sidewinder turbo, ZF5 5spd, 4WD Dana 60 king pin front, DRW, pintle hook and receiver hitch, all steel flat bed with gooseneck hidden hitch. Awesome towing capacity!
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