Sure grip and gear install 8.25

Currently I have an 8.29 with a peg leg 2.76. I have a sure grip and 3.23 or 4.10 gears or should I go for 3.55 instead. I have never installed a sure grip. I understand the concept of a rear. I out gears in an 8.8 mustang rear with a friend's help(he set them up) yrs ago. What tools would I need? I hear there is something that eleminate the crush sleeve., lastly do I get a complete master overhaul bearing kit? I sure all bearings are original? What's a decent kit that won't break bank? I ask here because you guys are full of knowledge and skill. You already got me motivated to build a magnum for my car.

Or should I just sell gears and grip and not bother with it.