I really appreciate all your replies, and I'm not surprised to learn that ERA has re-routed the brake-fluid supply lines in their newer cars (thanks for the update, SSSammy). Like CHANMADD, I'm also concerned about the close proximity to the headers shown in patrickt's excellent photos. I can envision boiling brake fluid inside the line after a long cruise on a hot day.
So far, I think the best solution for me is the one proposed by vettestr: "... a short steel line for each old rubber line may reduce the diameter enough to stop interference with the pedals ..." With two short steel lines inside the car, I can create a jog to avoid contact the bottom of the clutch pedal. This solution eliminates the need to drill holes in the brake box under the car and keeps the lines far away from hot headers.
At this point ol' ERA 452 is running fine, so there's no rush for me to tackle this project. If anyone has other suggestions, I'm listening. Guess I'll take mrmustang's advice and order a replacement clutch slave cylinder from ERA, too.
Thanks,
Dan Somers
Cobra Dream