Probably a good start would be to not shoot yourself in the foot by opting for a tyre and wheel combination which puts over 300mm of modern rubber on the road at the back.
This why I like the idea of Craig's wheels so much. You can choose a rim and tyre width.
My theory is yet to be tested though......
For my money a 2.5 V6 is plenty power enough provided the car is set up properly.