Need Information On Dropping My Truck

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I have a 1968 LWB and the rear has the original suspension, but the front has been swapped out for a 1986 C/10 front suspension. I want to stay with a static drop, and I don't want to have it too low, where I'll be scrapping and hitting every speed bump. I haven't decided on wheels just yet, but for now its sitting on 15" Centerlines and BFG's right now. How do I go about deciding on what parts I will need for the drop since the front and back are different. I imagine the back is just gonna be different springs? In the front, what is the lowest drop I can achieve without replacing spindles? I would have to replace the springs and shocks in front correct? Any advice always greatly appreciated. I'll see if I can find a pic of the truck to post.