Noob with a 4-6 drop, need shocks.

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building my first truck and have searched the site and web to try and find the correct bilstein shock, but haven't been able to. I'm running a 4-6 ece drop and would like to throw out the kybs for something better. If anyone knows what shock size i need it would be greatly appreciated, i'm looking at Bilstein B6s, would these work? http://www.summitracing.com/parts/bs...del/c10-pickup

also would a notch be needed for my rear end to be comfortable, i'm looking at this one from cpp http://www.summitracing.com/parts/clp-6372cnk

thanks in advance, just need some help here.