GM 12 Bolt Upgrade Q's

[Sonar Chief]

Hey, I'm NOOB when it comes to messing with rearends (cars ....) I would like to convert the GM Posi 3.55 12 bolt with a c-clip eliminator kit, anything else?

Can I use the same axles? IF I upgrade to larger spline axles then I need the posi unit also, right?

I would like to keep the 3.55's and if I could keep everything else that would be kool also .... cheaper too! I may participate in a auto-X or two but nothing like a circuit .... they are not here in NO Colorado, so street driven mainly!

Pro's and Cons with upgrading this 12 bolt?

Thanks for any advice ....

Michael