Questions about dropping my 69 SWB.

[birdistheword]

My truck is sitting on it's most likely original 45 year old springs. I just put a set of 275/60R15 tires on some 15x9 slots on the rear. And just ordered a set of 255/60R15 for the front for my 15x7 slots. I want to lower the truck just a little bit and give it a nice rake. What type of springs would I have to get? Would 3 in the front and 2 in the back do it? And would I also need the shock relocator kit and adjustable track bar? Thanks for any info. Here's a picture of the truck before the new wheels and tires and a pic of the new rear tires/wheels if it will help.