Installing LS1 Brakes on '69 Camaro

[Gregster]

Hi,
I am installing brakes on the front from an 2002 SS Camaro (LS1) brakes and I am purchasing drum hub assemblies for the front from a '67 Camaro, I have read that you need to turn down or machine down the hub but I am unsure exactly what needs to be done when I take them to a machine shop. Anyone who has done this if you could please let me know I would greatly appreciate it. I have searched everywhere and so far they all say to machine down I think .006" but where?
I am also installing the rear disc from the same vehicle which seems to be easier but I am also reading conflicting reports on if I need to use shim brackets or just install and also if it is necessary to use 2 left calipers or 2 left backing plates?

Thanks,
Greg