Best way to lower, and how much?

[CARR33]

I just purchased my first pickup, a restored 67 swb fleetside. I've read so much about lowering i'm now totally confused. I'm going with a complete cpp kit for the rear, but i've heard the half ton springs are mushy. Should i specify 3/4 ton springs and how short?
The front is getting 2" lower spindles, again what springs. I've seen some guys going down the road and they are so erratic it looks like they have square tires. Lots of short choppy bouncing.
I can take some harshness, but these trucks go too far.