lowering my 70 gmc

[ls70918]

I've posted here before and got good answers from you all. With that in mind, you need to know that I am no mechanic. I can muddle my way through projects, but you may have to dumb your answers down for me.

So I have a 1970 2wd, 1/2 GMC Pickup that I'd like to lower around 2 to 2-1/2 inches in the front and level the back to match. I also want to change the front brakes to disc at the same time.

I've looked into drop spindles for the front, but what's the best way to lower the back and not screw up the ride, etc.? Also, what brand of brake conversion kit should I use?