[Low69CST]

Yeah, your gonna have alignment issues. Since the new front springs are shorter, your suspension is gonna rotate some, changing your static camber and toe. (static is when your running straight down the road with no suspension travel) If you drop your truck a large amount with springs then you might have a problem known as bump steer or you may not be able to get your camber to the right angle at all. If you ever go to any shows with lots of lowered trucks you'll see this alot.

The back also depends on the amount you drop your truck. If its just 2 or 3 inches, go ahead and put the springs in. Then compare each tire to the bedside. If one is way more out than the other, or your truck drives funny then put an adjustable panhard bar in. If your going to drop yoru truck 5 or 6 in the back, then go ahead and get an extended pan hard rod.

As far as shocks, stiffer shocks would be nice because you have less travel to play with. But you could try your shocks and if your truck sways too much, or bottoms out on them then change them. Also, keep in mind that if you lower the rear 5 or 6 you need to watch your shock angles. Early classic has some shock relocator that will straighten your shocks back up and make them work better.

Also Early classic has drop spindles that will let you put C-10 rotors on for. Using spindles on the front rather than springs will make your truck ride and handle much better.