[6d7gto]

The restoration guide doesn't seem to differentiate the routing for RA or HO.

I assume you're talking about the hard brake line from where it screws into the rubber brake line on the passenger side correct? It runs from the right side of the car traveling downward until it runs along the back of the cross member to the driver's side of the car. The distribution block is located on the driver's side inner frame rail. This hard line attaches to the cross member with a special clip. This right brake line never goes under the frame at any point. It then makes a 90 degree bend upward for a few inches then a sharp 90 degree turn forward toward the front of the car running alongside the motor mount perch. It travels forward atop the cross member under the engine for about 4" then bends toward the upper control arm cross shaft. Same area where the gas lines come out of the front cross member hole. Before it gets to the control arm, it heads back to the rear toward the distribution block. The brake line is always very snug against the frame so I'm not sure how the headers would ever touch this line unless the headers are nearly touching the frame itself. I can take a photo if my description is unclear. Hope this helps.