In my original project - 1993, I put a Facet pump just below the header tank. The header tank was behind the baggage sack as yours is. I ran 5/16" aluminum from flare fittings to the fuel valve. It ran down then under the seat at the side, then up the forward door post to the valve. I can take a picture of my current project and show you the the run. This time, the header tank will be behind the passenger seat as is customary now.
You could run rubber line the same way if you chose.
Re: fuel line from header tank to firewall.
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