I'm doing a turbo conversion on an L28.  Currently collecting parts, but all you need is a turbo manifold and turbo really (thats if u wanna go budget++)  But difference wise not much, apart from slightly different pistons and rings. 
  
But $2000 is a good price.  I've spent 2k+ importing parts.  My friend spent even more just to get the engine imported!  When the engine costed $300 us!