My 2000 Chevy had A-arms with stock coils..about a 3" drop and 2" shackles and 3" springs on the rear. This pic is from early 2001 when 20's were almost unheard of lol.

 

I have the DJM 4/6 (LCA's, flip kit, notched frame) and it looks nice but the weight transfer is not as good as it should be for serious power. I would 2/4 for a truck that is set up for drag racing and more than 400rwhp...