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Compression fittings like the ones that you posted aren't designed to be used on EFI applications they will leak under the high pressure that boosted EFI systems produce. The correct way to adapt 5/16" hardline to -6AN would be cutting flaring the OEM line to accept a -5AN tube nut then using a -5AN to -6AN union.
This is ultimately worthless though since you still can only flow the amount of fuel that the OEM 5/16" line will allow which isn't much.
Ideally you'd replace the factory lines to be all -6AN hose or 3/8" hardline, the 3/8" hardline would cost less than $50 including the tube nuts to do the entire car and you can bend it by hand.
If you need help planning out a fuel system feel free to send me a PM and I'll help get you sorted.
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