89 limited slip Ford 8.8 IRS swap help

I've done it in a '66. Here's a series of articles that I wrote on the project:
https://dartslantsix.wordpress.com/2014/06/27/1966-dodge-dart-irs-project-part-1/
https://dartslantsix.wordpress.com/2014/06/27/1966-dodge-dart-irs-project-part-2/
https://dartslantsix.wordpress.com/2014/06/27/1966-dodge-dart-irs-project-part-3/
https://dartslantsix.wordpress.com/2014/06/27/1966-dodge-dart-irs-project-part-4/

The entire subframe won't work for a number of reasons that I talk about in the articles. Not sure how good your fab skills are, but it is a lot of work. It took me about two years to get everything working. Good luck.
Good read.:study: Thanks for the links. I'm definitely going to buy that book you noted in your article. I'm going to head to the drawing board ASAP. A few questions though. Why couldn't the stock cage mounts be modified to mount to the frame rails under the car? Seems like that would solve a lot of your structural issues? Did it incorrectly distribute the weight that way or was it just a clearance thing? Also what if the frame rails were cut and fabbed differently? I'm ok with the stock length of the half-shafts because I plan on squaring the car up and extending the front end out a few inches as well for a larger track width(looking at some wide body ideas for body work). What was your total cost developing the prototype?