I remember reading somewhere that the P76 rotors do fit.
Apparently they bring the centres closer to the middle of the car by about half an inch where as the Torana rotors have the centres about half an inch further outboard than the originals.
This will supposedly help out with the bigger feet.
I'm in the beginning stages with a front end replacement myself (very beginning...just can't seem to get going on it and am getting very frustrated).   I would be very interested to hear how you go with the installation.
How hard are the P76 rotors to come by ??