Gday Merv,
I believe you have 2 options. Run and LS1 computer with cable throttle, or the L76 computer with fly by wire. There are a bunch of things that need to be changed if running an LS1 computer (crank reluctor wheel, knock sensors), so if starting from scratch I think the fly by wire with L76 ecu would definately be a better option. Im not sure if you can run a cable throttle with the L76 computer (Its the "E38" ECU).
The electronics side of the pedal isnt that difficult - there are just 6 wires to run from the pedal to the ECU. Some fly by wire cars have an intermediate throttle control, but the L76 doesnt. The engine harness comes with only one plug for the ecu, the other plug (that takes the throttle input, MAF, and lots of other things) can be purchased easily from the US or there are local sources (sideshow) . I THINK I have all the wiring figured out on paper and am happy to share. Last few pieces of the puzzle fell into place wth the help of some guys on the LS1 forum.
You can get sidey to make up your harness for you complete. I like a challenge and Im a complete tight arse as well so as long as I dont smoke the ecu on startup I should save a few dollars.
Cheers