When we bought our L78 car it had a cobbled up fuel pump to Carb setup. I bought the stock reproduction replacement lines. I had to tweak the two 90 degree pieces to get the centre to centre distances right. Other than that, they went together fine. The flare nuts have a straight thread and sealing is done by the inside taper on the double flared ends. The threads aren't meant to seal the fuel in, just to tighten the flare against the taper in the "Y" block or carb inlets. The stainless is single flared. Doubt you could double flare it anyway. When getting flared, the end of the tube has to be square or the flare will certainly be skewed off to one side enough that it isn't going to seal. Some cheap flare tools are just plain useless on steel and wouldn't even begin to do stainless. I've screwed up enough brake line flares to have some idea of what I'm talking about. It does take a little care and practice.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.
