Thanks for the additional response.
I think we want to fall somewhere in the middle of just looking the part and and a competition rally car. Maybe something that could be driven in the SCCA rallycross events but does not have to be competitive. I agree the tire is a great place to start. That is generally the approach we have taken with suspension on a couple other builds. I am just in the initial stages of this so keeping my mind open to options.
I had a short conversation with T3 and they have done a rally setup using bilstein cartridges for a client in the UK. Also stated their existing arms offered enough adjustment to account for camber with the lift. Sent Carl an email regarding info on what the factory cars may have been using.