Thanks Fibonachu;
That is the original bracket from a a GM Connect and Cruise LS3. For a number of reasons I am going to keep the pedal mounted to this bracket and concentrate on providing a "platform" for that original bracket where the platform would be secured to the cab toe board/firewall in such a way that when I bolt the original bracket to that platform, the pedal is where I want it.
Your comments have also got me thinking more about the thickness of the platform... I would start of course, with cardboard and then translate that to 20 gauge. Once I got the platform correct, then I would translate that to a thicker gauge of steel and weld her up.
It might take me a while (I am both old and slow) but I will publish the end result when all is said and done.