I had the same problem with my clutch line. It would get hot and loose all freeplay in the pedal. I used header wrap from summit racing. cheap and easy fix.
I used 3" square and 45 the ends. capped and smoothed the ends. I modified the stock mount brackets. It looks good but I have to agree the the stock mounts appear a little weak.
I did my conversion using a Scout II box that mounts inside the wheel well next to the Shock tower. Very clean install. A little trimming of the inner fender. A tilt steering coloum from and early 80's Camero bolts right in using original hardware and mount.
>:( I just sh*t canned a new MC I bought from Cool Cruisers. The rear section never worked. Just installed a 93 fj80 MC and it works great. If your sure it's not leaking on the ground then it has to be going into the booster.