I did play with Jag stuff and even welded some mounting tabs on the top of a rear Jag hub. The Jag geometry is nice and you can make your own arms with the correct length for the track you need. I have also fabricated uprights to take a newer bearing and flange (C4 Vette) like you did with your castings Dom. Marc check out the results of last years optima battery shootout and that answers your question on original geometry. Ol hot shoe Bruce in 3190 cleaned up.
http://www.youtube.com/watch?v=mVt2Wp9VRX0
The suspension in these cars needs to be understood and set up correctly and it works magnificently.