I believe you can just use a basic 2 jaw puller if you are installing lift keys. Raising stock keys is just a ratchet and socket like hondarider said above.
It's going to ride like a brick with the stock keys all the way up and even worse if you crank the lift keys up. Either way you are applying a lot of version force to lift the front making it stiff.
What about the cognito arms? Maybe someone can give you a better route than the lift keys.
I would not recommend lift keys!
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08 LMM Chevy CCSB
Relentless Diesel trans
JoshH EfiLive tuning
554hp 1014ft-lbs 7/30/11