Going from 6" to 8" what's needed

[Ak-Amarillo]

I have a 06 f250 with stage 2 fabtech 6" twin shocks and ladder bars I want to go 8" thinking all I need is block for rear and new coils my shocks are long enough for 8" I need to know if my fabtech control arms will still work with 8" and do I need a new pitman arm any help