Jeff, that fuel fitting has plenty of potential to be a problem. Determining a real answer would require an actual flow check...pump on with the servo end of the fuel line stuck in a calibrated bottle. Why bother? It's a taper pipe thread, and that excess thread is doing nothing. I'd just unscrew it, hacksaw about three threads off the end, clean it up real pretty and reinstall.
The fuel line and battery cable proximity to the exhaust headers is another opinion item. In mine, they are certainly closer than they need to be.
I see you have a throttle cable running to a bellcrank, said throttle cable being above the wing of the oil sump. You could fixate the cable and hose just outboard of the throttle cable by fabricating a simple aluminum plate. Attach it to the sump bolts at the inboard edge. Width would extend outboard under the throttle cable far enough to mount a few adels for the cable and hose which would run parallel but separate. You can even add a radiant heat shield to the outboard edge of the plate if you wish.
BTW, you're doing great, because you are paying attention to details.
