We have done several inboard disc rears on a 57 and a 55 which gave a very nice driving/riding/handling vehicle. With this IRS the bottom frame lip can be heated and turned out which allows the whole Jag cradle to fit up in place. Have an outboard disc IRS in "the pile" but have not used it yet. It's quite a bit different than the older one so I'll follow your build with interest. Have not done a Jag IFS yet but will probably do so since my favorite IFS, the Pacer, is now extinct. Here's how one sits with the Jag/Pacer combo.
[img]https://i.postimg.cc/Wt0NpXKJ/Chuck-s-55-006.jpg[/img][img]https://i.postimg.cc/XZcMSzXV/Chuck-s-55-007.jpg[/img]
