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Check this out. Lots of info on the Jag conversion. In the attached below, go to the second page and scowl down to the 21 posted page. There is a list of Jag IFS and IRS installs. NOTE: This is, by far, the most concise list that I have ever found and should be saved somewhere on FTE for our members as a resource.
If you use a Jag XJ12 IFS, you might want to install XJ6 springs as the XJ12 engine is much heavier than the 6 cylinder.
The XJ12 springs wouldn't let the control arms come off the bump stops with my small block Chevy motor. This all depends on how heavy of a motor you may choose. I believe the XJ6 is your best bet.