I tried to respond directly to Jake Evans of Halifax Canada but mail
failed...

        An early Porsche 911 six will bolt in (150~200hp) with minor
fabrication (rear mounts/engine compartment sealing) and they are not all
that expensive.  A few years ago I was planning to put one in my 78
Campmobile...(wife spent my funds on more important stuff? and I wound up
putting a VW motor back in it... 2.0 liter just like what comes in an 80
model).  There is a Porsche "dismantler" in Atlanta GA and they priced a 2.0
liter 901 style motor (air cooled flat six) with carbs for $1000.  They told
me this is the only Porsche 6 that will bolt to VW transaxle...any later
style Porsches will require the Porsche transaxle as well which makes the
project no longer a "bolt in"(?) and considerably more expensive.
        By the way, (Jake) if you buy the 80 model (gas engine) vanagon, you
do realize that it is air cooled and Subaru/Golf/Jetta transplants will
require radiator and lines...which makes it really a pain.  If you want to
do one of these conversions try to locate a water-cooled vehicle to start
with.  This overcomes this hassle and you'll have heater/defroster to boot.
Hope this helps.

Fetner