You can get this for the front.
http://www.speedwaymotors.com/1947-5...Axle,5842.html
Sid's will lower a stock axle also.
http://www.droppedaxles.com/
I like the dropped axle better than the lowered springs. lowered springs on the front limit your suspension travel.
There's plenty of options for the rear. A leaf spring kit and/or block setup are probably your best bet.