Time for new lift or no?

[Immaculate Reflections]

I have a 2006 Silverado crew 4wd with 160k on it.  Dealer installed a Trailmaster 6" lift kit when it was brand new.

 

Fast forward to today and some things need to be addressed.  It has a bit of a rake since it has a 4" block in the rear.  I want it level and was looking at some Deaver springs to replace the current ones, but then I started thinking about shocks that have 160k on them.  Maybe its time for new shocks too?  What shocks should I get?  I had Bilstein 5100's on my 2015 and love them, but it wasn't lifted so I don't know if those are available with a 6" lift?  I think the ball joints need replacing too.

 

So is it worth changing the springs and shocks or should I just get a whole new kit?