I did the hard way and bought coils of 3/8" and 5/16" stainless tubing from Summit Racing. I inserted an insulated 3mm solid copper wire (from ROMEX) into the old fuel line, pushing that wire from the engine compartment, emerging at the junction point beneath the fuel tank. From the rear of the car, I pulled the old fuel line out. What remained behind was the copper wire, which served as a guide when I force fed the stainless tubing towards the fuel tank. I was uncoiling tubing and pushing it forward. You of course have to have all the center tunnel openings exposed to see your progress, and to bend up the factory hold-down tabs. You'll also need to use a mirror at the gas pedal area to see your progress. I did this 15 years ago, and I don't recall Tangerine Racing offered the pre-bent stainless fuel lines yet, possibly, and I was too cheap buy it pre-bent. My vaguest recollection is that I had to cut/remove the front end of the old fuel line, since the plastic/nylon lines are force-fitted onto curved steel tubing at the gas tank end. I eventually got the new lines threaded into the OEM double hole grommet at the base of the tank, and they simply come straight out. I also added sleeves of slit fuel hose onto the stainless tubing to limit vibration transfer. After you get it installed, you'll have to blast the lines with compressed air clear to ensure you don't have a bunch of grit/dirt when the tubing was advanced forward. I also installed two proper clamps at each junction whenever fuel hose meets stainless tubing.
15 years and counting with no leaks.
A difficult job at best, and oh yeah, I did it with the motor still in place.
So I was working in a cramped space. If I had to do it over again, 1. Buy from Tangerine Racing or 2. Remove motor if using coiled tubing.