I was involved in a I4 conversion which was an old vanagon diesel.
I'll guess from memory:

The diesel engine mounts, oil pump, and oil-filler tube, and fly
wheel, are the key components that you don't currently have and will
most definitely need.

You obviously need the I4 wiring harness.

You'll need to fab  exhaust system ( at least the engine pipe to cat
)  as well as an intake system.
You will not be able to put the current I4's intake where it's
currently located relative to the engine.  Expect to do some funny
stuff to get this part work...

The cooling stuff is pretty straight forward.

Make sure your exhaust is pretty solid, and ideally has some flex
coupling it it or the whole thing will
regularly self destruct.

that's a first pass

-C-

At 10:57 PM -0800 11/3/02, fgfd gfd wrote:
>Thanks, been there seen that.  Too expensive for me
>right now, especially when I have a great running low
>mileage, top end rebuilt 1.8 `83 rabbit engine sitting
>right here.
>
>Do they sell JUST the parts to install a I4 into a
>vanagon if you have your own engine? I went through
>the site and saw nothing...it is kind unorganized so
>maybe something is hiding in there I missed ;)
>
>Thanks
>
>Thanks
>--- Bob Stevens <mtbiker62@hotmail.com> wrote:
>> http://tiico.com/index.html
>>
>> go there.
>>
>> Bob Stevens
>> '87 Syncro Westy TIICO
>>
>>
>>
>> http://groups.msn.com/BobsPhotoShare
>>
>>
>>
>>
>>
>>
>_________________________________________________________________
>> Unlimited Internet access for only $21.95/month.
>> Try MSN!
>>
>http://resourcecenter.msn.com/access/plans/2monthsfree.asp
>>
>
>
>__________________________________________________
>Do you Yahoo!?
>HotJobs - Search new jobs daily now
>http://hotjobs.yahoo.com/