I pre bent all of my brake and fuel lines in stainless using hand benders and a hand flaring tool. AN fittings are 37*.
Brake lines were plumbed in 3/16 od with a wall thickness of .025 or .028. The fuel line is plumbed with 3/8 od with the same wall thickness. Seamless stainless was used.
Map out the plumbing and determine the type of connections needed. Buy the hardware from Jegs or Summit (they have very liberal return policies) if you need to send the fittings back (unused of course) they have no issue with it. You will make several mistakes flaring until you get the hang of it so buy plenty of tubing. I bought mine from a local shop called tubular techniques a custom tube bending shop. I probably could have found it cheaper, but they always had it in stock and I have done business with them before.
I bought my flaring tool and benders from mcmaster.com Again, probably paid more, but mcmaster has the stuff in stock and sells nice stuff. The benders are Rigid and the flaring tool was Imperial.
The key is read the directions that come with the bender and grab some welding wire and a tape measure and lay out your bends. Measure and mark the tube, then start bending.
I found that a GOOD lubricant (WD-40 is not a good lubricant) used on the flaring tool made all the difference in the world.
I cut the tubing on a band saw and deburred the cut with a wire wheel. You can use a cut off wheel if you want and just make sure your cut is clean and square.
After flaring, buy a set of plugs and check the flare for leaks. Dip the end in a bucket of water. No bubbles no troubles my friend!
Time consuming, yes, but it looks nice at the end.
Hope that helps
Darren