Grumpy,
I'm not sure whether this will help or not, but I just installed the overflow lines in my car. I used ¼" fuel line rated for fuel injection systems. I'm sure regular fuel line would have been fine, as there is no pressure, but it's all my local parts store had. After three weeks of no Moggie, I didn't have the patience to start a parts search.
I rant the tubing down the inside of the inner valance. On my car, there is a small harness going to the front lights, as well as the hard pipe for the one-shot. I followed the one-shot pipe to the removable section of firewall near the cernterline. I added an Adell clamp to turn the hoses downward. The Adell clamp is mounted with one of the center section fasteners. Everything else was buttoned up with nylon wire ties. It's a similar path to the overflow piping on my mother's '64 drophead. It's a difficult spot to get a decent photo. Hopefully this one will help.
Naturally, I needed to go for a test drive...Yippee!
![[Linked Image]](https://tm-img.com/images/2022/10/12/IMG_3256.jpg)