Depending on your wheel and tire combo it can vary. The best thing to do is put your wheels on and do a little cutting and see what kind of clearance you have. Probably would be quicker and cheaper because shipping on one of those rearends would be ridiculous.
Ditch the a/c and run vintage air if you want to....Change the balljoint angle on the top control arm (either move the mounts up or pie cut the control arm) Minor firewall tub...If you are stockflooring the truck and building the whole frame you can move your body mounts backwards 1" and make even less of a hole in the firewall...you can keep the stock fan but it is better to swap to an electric setup...and a new exhaust is about all it took on mine besides time and money...Let me know if I can help further...L8R