I'm replacing all my brake and fuel lines on my car. Outside, with the body on the frame. Why bring up this info? I, too, thought about buying a pre-bent kit for both. I decided to buy the straight tubing and do it all myself. I'm glad I saved my money.
As was mentioned, if you're doing a frame off, by all means get the kit. If you're not, then getting to all the line clamps retaining the lines to the frame will be next to impossible in some areas. Even if you do get the clamps out, then you'll have to figure out how to twist and contort the lines to get them back in between the body and frame.
I'll just run mine as close to factory and use as many retainers as I can. In areas where I can't get them in, I'll route them the best way I can.
I'm building a driver, not a show car. If you insist on running them *just like the factory did*, good luck. Mines not done yet so you can do mine when you get done... :wink: