School me on swapping 6 to 5 lug, lowering and converting to power brakes all at once

[Rob68c10]

Ok I have a 68 short bed and I want to do a 4/6 drop on it, rebuild the front suspension, and convert to power brakes all in one shot. First let me tell you what I have.

I have:

-'72 5-lug front suspension
-'72 5-lug rear
-power brake booster from the '72
-cab and pedal assembly from '72


My questions:

Is it easiest and cheapest to use the '72 front end to convert to 5 lug/disk brakes/and lower it?

What modifications am I going to need to install the power brake setup?

Should I go ahead and do the rear disks now or is that something I can do later down the road if I want without too much hassle?

What are some things I need to consider before doing this? I have read something where the rear tires do not sit in the fender correctly? Are there any other need to know things like this?

I have looked into the ECE 4/6 drop, any other suggestions?

Suggestions on brand/kit for the front end rebuild?