Notching the SFC's not fuel line. Justin I knew you encountered this issue but I wasn't sure if the 67 and 68 were routed the same.
Pete, since your SFC's are installed, even if it was notched being one very long piece I don't see how you could fish it through the notch and into place. Sounds like you will need to do some custom routing.
I like going along the tunnel idea. Similar to the 65 and 66.
Thanks for the pictures and responses guys. I know the thick metal cover will not fit without some type of modification becaause mine are square shaped tubular, but I'm not sure if I could even squeeze the line between the connectors and the floor. The Tin Man connectors are really close to the floor pans. I will probably opt for the tunnel route. I really don't want to notch the subframes. I believe that would weaken them and they were put there for the opposite reason.
I don't think notching the sfc's was a serious suggestion unless when fabbing the sfc's you notched it and then installed a reinforcement plate. At least you don't have to think about that for it's already installed. Just re-route the line down the tunnel. To me, it is a lot cleaning looking having the fuel line hidden more.
By "notching" the squart tube sub frames I refer to the process of cutting a half moon shape out of the offending area of the SFC. It should only require a cut through the corner of the square tube. Then fit a half round piece of steel pipe large enough to easily pass the fuel line through the SFC at the corner where it is near the floor. Then weld the steel tube into the SFC and ground smooth.
I have the TCP SFC's in my car and there is a plate right there that I plan to drill a hole through and either use a bulkhead fitting to go through or a rubber grommet with a rubber hose passing through.
I have the square tube SFC's on mine and I tried the 68 fuel line and it just wouldn't work and I ruined it trying. I talked to the owner of Fine Lines and he suggested I try I think it was a 69 fuel line if I remember correctly. It fit with some minor adjustment. It's been awhile since I bought it so I'm not positive it was for a 69 but I think it was. It routed a little differently than the 68. You might give them a call to see if I'm right.