3/4 drop on 85 GMC lwb

[my 85 gmc]

Can you guys give me some help on what is the best way to lower a lwb truck 3 inches in the front and 4 inches in the rear. I was thinking of using spindles and shackle & hanger kit, what are pros and cons to using this method also my truck has a two piece driveshaft will there be any pinion angle problems.

Thanks Rob

My truck is a 50,000 mile original truck including paint but I think the lowering bug has bit.