The main fuel line is going to be 3/8", and it runs down the drivers side of the frame. it connects to the tank via a short length of flexible hose near the center of the car, runs along the behind the cross member and then up and over the cross member and through the hollow on the top of the frame alongside the upper coil spring pocket. There's a clamp on top that holds both fuel lines there. To get to it you'll probably have to loosen all the body mounts a little so that you can pick the body up a little - NOT MUCH though because you can bend things up around the front fenders. Of course, if you're doing a frame off restoration that makes the whole job easier, at least for the fuel line.
When it gets to towards the front of the car where the frame doglegs inward at the firewall, it goes into an oval hole there and sticks out through another hole on the front side of the front crossmember that goes under the oil pan. From there, there's another short piece of flex hose that connects to the fuel pump inlet.
I know you said you didn't want stainless, but Inline tube (Inline tube The brake plumbing experts
) has lines available in both OEM steel and stainless that are pre-bent to the proper contours.
In fact, I have a *brand new* 3/8 fuel line from them in stainless that I bought for my 69 that I won't be using (I decided to use 1/2" fuel line instead).
Want it? It's yours for whatever it costs to ship it to you. I'm also including a .JPG that's a scan from the assembly manual that shows the line routing.