Teflon- (PTFE-) liner hose is sensitive to bend radius. But I don't see a problem with the ID since it's essentially the same as the tubing; and most cars get by with 5/16 tube, performance engines got 3/8, and both were using engine-driven fuel pumps that don't "suck" worth a crap.
Racers and wildmen move up to 1/2" nominal tube, Dash 8 hose. How much fuel can you push through needles 'n' seats spec'd at 0.130; especially if you have sense enough to use an electric pusher pump at 14+ psi with regulation down to whatever the carb wants somewhere in the engine compartment, AFTER all the bends in the fuel plumbing? Even Dash 6 hose and 3/8 tubing supports substantial horsepower when used with a pusher-pump at the rear.
The big benefits to the Teflon- (PTFE-) liner hose is that it's non-porous and lighter-weight than rubber-based hose, tends to have longer service life than rubber-based hose, and generally smaller diameter, too.
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