<VV> Corvair engine in VW van

[Kinzelman, Andy]

Guys,
I have a T2 VW van with a Corvair engine & manual transaxle.  This kit apparently used some adapters to attach the stock VW halfshafts to the Corvair stub axles.  A VW guy is interested in it, but wants to put it back to VW power.
Does anybody know if this is an easy conversion back - or is some stuff hacked up during the initial conversion?
Thanks,
Andy K.