Here's what you do (on a 69 anyway , but I'm sure 7 & 8 are the same.
You already have the line straightened . Jack up the car all the way around and put 4 jack stands as high as you can , or at least so you can lay on a creeper and have about 4 inches from your chest to the lowest point. Take the Pass. rear subframe bolt ALL THE WAY OUT , don't worry nothing will drop and you WILL be able to get the bolt back in. Lay the fuel line next to the car right under the rocker , take the front part where it wraps over the frame rail and slip that over the end of the subframe and slide it all the way up to right behind the front subframe mount. Now that's done. Now go back and bend the line slightly (at exactly where you straightened the 180 out of it) this will allow you to slip the end up over the rearend , once you get it over the rear end start straightening it back again , just get it close to where it looks like it'll start hitting the mounting clips. Now SRART AT THE REAR and put the little bracket with the square hole in it back on this will locate the legnth of where it needs to be. Also at this point you can see that the end of the line is a straight shoot to the sending unit line. Now start putting your clamps on and fitting it as you go forward , leave them loose after you get the bolts started in them. Work your way forward fitting and slightly bending as you go , when you get to the front it'll be perfect. Take your jack and jack the subframe back up a little if the bolt won't start , and run it in tight.
Put your clamps on and go for a drive.
Piece o cake.....
(Don't loosen ANY of the other subframe bolts except the Pass. rear)
69 Daytona Yellow / Yellow Houndstooth , 350 , 4 speed , air , convertible !!