I want to do a lift on my 86 sammy and just doing the leaf spring perches seem to be the cheapest way to move the leaf springs on top of the axles.  My question - Is there anything else that I will need to do such as drive line spacers, steering column extensions... 

Thanks in advance!

I would recommend picking up the Sky Manufacturing Stage 2 Spring Over Kit (http://www.sky-manufacturing.com/new/detaproduct.php?id=92).

It's a little expensive compared to a true do it at home method, but it comes with everything you need for a basic Spring Over Axle conversion.   At the very least I would use their spring pads, as the extra bracing means your upper pads are square and they won't rip off the tube later in life.  It also comes with one half of the high steer kit.  This will get rid of bump steer and works great.  The only issue is your tie rod is still low enough to catch rocks, but they would have hit the axle anyway. 

On a lot of SPOA installs the springs end up being slightly concaved instead of straight or in the stock position.  I like adding an extra long spring as a helper if this happens to try and ensure a neutral spring shape, or slightly positive.  That comes down to personal preference and how much lift you want though.  And if you plan on doing a lot of mudding/hill climbs you might want to look at building a traction bar at some point as well.