I've done the same and loving it!  The guys at Bostig are great to work with and their kit rocks.  
 > Date: Sat, 31 Dec 2011 07:25:52 -0500
> From: hhoffman@IP-SOLUTIONS.NET
> Subject: Bostig engine coming... My 2.1L for sale in Philadelphia, PA
> To: vanagon@GERRY.VANAGON.COM
> 
> Hi All,
> 
> I took the plunge and am going the bostig route (yay!!!). I've got a
> solid performing 2.1L with, a guesstimate [1], of 150k on it.
> 
> I don't have room to keep or the want to do a rebuild. Anyone interested?
> 
> Cheers,
> Harry
> 
> [1] Odometer was broken when I bought the van and the reading was ~
> 150k. It wasn't being driven when I bought it but who knows how many
> miles were put on when the odometer actually broke