Chris,

I'd have a real good idea of body size before I'd tackle the frame. Like the fellas said, have an idea overall drawn out of what you want. Once you get far enough to start the frame, I'd get on a forum designated to Jags and ask them if they have specs on the model you have for reference. When I installed the Corvette IRS I hit the Corvette forums and found a couple fellas that sent me the specs in PDF format. Like Dave said, figure your ride height and match the factory specs, to a point, for caster and camber. Just as important for the rear. I had to narrow mine and it was pretty difficult for me to maintain those settings. I'm still going to lose a bit under full suspension travel but at ride height it's perfect.

What helped me the most on the IRS, I had the factory bracket that the front of the dog bones (links) mount to. I found a 85 Corvette and asked him politely if I could take some angle readings of the bracket with the bracket mounted to the car. For me that angle was what I set the whole rearend up around. I used a digital inclometer. It can be zero'd off the bottom of the hub.

David