Any good exhaust shop will be able to work things out for you. I did not notice any particular issues on the driver side, other than the requirement for the '70 motor mounts to clear the various parts.
I'm using JBA's with the early mounts on the D-coder and didn't note any issues with cables, fuel line, etc...have had them on for about 7 years now and nothing has cropped up. The only installation issues were with shock tower/steering box clearance, which the later mounts you're using solves.
If you are concerned about exhaust heat near the cables/lines, you can always shield them with products like Firesleeve, which I've used extensively on the race car...the battery cable and fuel line do run in proximity to the headers, which generate extreme heat in a racing app, and by shielding them with a combination of aluminum reflector and firesleeve, they've provided good service with no problems (or boiling fuel *G*)...
The e-brake cable is not typically tied down. It normally has tension in it anyway, which would preclude tying it anywhere.
The speedo cable can be anchored just about anywhere you want as long as you don't pinch it. I'd suggest lubricating it too. The length of the speedo cable gives you a little leeway to work with, but not much.
I do not have any issues with either the speedo or the e-brake cable on my ride. I don't have any good pictures either though. Here is the best picture I have today. You can see the cables in question.
That's the picture I was looking at on your site (smaller res though). It looks like you have a speedo cable adapter of some sort making the overall length of the cable longer. I don't have that much slack in mine.