We had ours done 2 months ago by www.tsrengineconversions.co.uk
and now have Subaru 2.2 power that sails up hills and cruises at 80mph. We took ours to Yorkshire the other week and it cost us about £45 to travel the 285 miles, our old 1641 would have cost us nearer 70!
For pics of van, see JustKampers: http://www.justkampers.com/album/jakob68/2415/1
or here from the Brighton Breeze (the green one)http://www.flickr.com/photos/16306206@N07/sets/72157608213224195/show/
Will be taking detailed pics of conversion soon.
And for what its worth, the radiator is discreetly tucked just inside the engine bay, with no louvre style slats cut for ventilation. Instead the number plate is cut out and evectively put on stalks in the same spot that it used to sit, with a 40mm space between it and the engine cover that it used to sit flush too. Thats to say that if you in a car following you wouldnt notice or know that there was a gap between the number plate and bodywork (to provide the radiator airflow).
We have already done more miles on the scooby than we had in the 18months that we were running the previous 2 air-cooled engines!!! I hope i am still singing its praises in a year! Time will tell.
Keep those classic lines alive, but use a reliable motor!!