I allways see lots of Posts on TC asking how to change the main front to rear fuel line on 67-69 Camaros, thought I would offer up my 2 cents worth.
I changed 1 today on a 69 Z28, it was pretty easy, I had the car on a 2 post hoist, and after the old line was out ( i chopped it apart) I put the back end of the new line over the diff housing and loosely attached a couple of the fuel line clamps on the rear frame rail and then put the front of the fuel line on the INSIDE of the subframe and tied it up against the frame. I then took out the trans crossmember, while supporting the trans, and took off the Rite Rear # 3 subframe mount bolt. I then put another stand under the subframe to support it at the firewall area on the passenger side and then loosened the firewall # 2 subframe mount about 4 turns. I then put a big long bar in the back of the sub frame and pryed down slightly. This allowed me to remove the rear upper cushion. I then simply pushed the fuel line between the subframe and floor, and then reinstalled the crossmember and sub frame mount/bolts. Then put the clips on the line and bolted it down. Total time was about 2 hours. If the car has headers you might have to take the Passenger header off.