Fuel line routing dos and donts?

[absintheisfun]

I finally have everything ready to run with the last step being routing fuel line. I'm using a vaporworx controller, so single line. I'm trying to minimize flex line to a foot near the tank and a foot near the engine with solid 3/8 the rest of the way. So the questions...

1. Inside the frame rail seems the safest, but would it be okay/safe/allowed at races if its outside the framerail but inside the pinch weld?

Because

2. How close is too close to exhaust?

Inside the framerail would put the line within 2 inches of the muffler and about 6 inches from a few points in the exhaust and closer to the header collectors. I could probably run heatshielding at some points, but wanted to see what yall have done and had some success with.