I'm curious about this also and have read that you want to find diesel parts for the conversion, preferably from an '83 for the different carrier bars than the '82 uses.  Bellhousing, carrier bars, oil pan designed to be used with the 50 degree install angle of the engine, oil pump to be used with that pan, and I believe also the input shaft from a diesel trans.  Others will chime in with more and better info.  I've seen the used parts packages offered on Samba classifieds for about $500. I found a complete '82 diesel van for that price but it was half-buried, so I passed.  You could probably find a Kennedy adaptor plate and cobble the rest. 
Neil in BC runs a Yahoo group on I-4 conversions but there is not much traffic on it. This is alleged to be the most cost effective engine swap in addition to keeping the van "all VW."
Good luck and keep us posted on your progress.  
Stephen 

     On Sunday, October 25, 2015 1:58 AM, Rob <vwrobb@GMAIL.COM> wrote:
   

 I'm looking for some general information on putting a gasoline VW I-4
into a Vanagon.  I'm not asking the right questions at the samba search...

What do I need to do the conversion?

Right now I'm just curious...

Rob
vwrobb@gmail.com