Oh yeah, it's way easier to do that job with the body off - for sure. The lines go up and over the top of the rear cross member, next to the coil spring pocket, between the cross member and the body. From there towards the front of the car, they tuck inside the drivers side frame rail, kick out to go around a plate on the frame that's about halfway between the wheels, then tuck back inside the frame --- oh wait, you've got a convertible --- fully boxed frame? Then they probably just run along the inside of the drivers side rail from back to front, secured to it with clips along the way. The brake line connects to the distribution block on the inside of the frame rail in the engine compartment (on a 69 at least), and the fuel line goes into a hole in the bend of the frame there and comes out through a slotted hole on the front side of the front crossmember. There's a flexible line/hose connection from there to the fuel pump.