I'm looking to do the same thing, although I probably won't go as far as to replace the lines from the tank to the hardlines on the car.... You might be able to flare the ends of the barb fittings on the tank and use a flare to -AN adaptor or you could switch to a fuel cell

I only plan on taking that part of the car apart once to change to a high volume pump when I drop the turbo Z31 motor into my car.
Now in the engine compartment, that's a completely different story, there I plan on converting just about everything I can to silicone, braided line, or some other super long life, high pressure hose just so I don't have to d!ck around with it ever again...
You might be able to use a compression fitting and an -AN adaptor off of that too, just a thought.
Good luck,
Benjamin Jennings, MCP
'95 240SX Champagne Gold