I did the same rear swap in my car last year. As it was already mentioned if you don't care about leaving it stock, you can get a complete rear end with a 3:08 ratio or close and you're done, easy change over. If you chose to retain originality you won't be able to use your existing carrier, and buying a Yukon or similar complete set-up has it's disadvantages according to many reviews out there. I ended up leaving my carrier in it and used a spacer to get the new ring and pinion to align. Spacers are offered here: https://www.amazon.com/Bolt-Vette-Ring-Spacer-Bolts/dp/B00SDI83Y6. Don't believe the hype out there that claim spacers will come loose. That's BS. You do have to keep in mind that the change over takes expert knowledge, takes time and lots of precision touches to get clearances correct. And you will have to locktide everything to keep things from ever loosening up. Took me 2 weekends to do, taking my time and double checking everything before putting it all back together. It's a fun job, don't expect any huge gains unless you go up to 3:55 plus.