Interestingly, just been reading about the 250 engine swap done in Spain. The mechanical stuff looks quite straight forward. The issues are (like the 225) the ecu but equally the VVT. The 225 doesn't have a VVT. They have kept the Sagem 3000 225 ecu and wired the senor and VVT actuator. They are running a Conservative map...and engines making 318 bhp.
I have tried to contact them but think they are keen to keep stuff 'secret'. Also the google translator isn't great. Anyone fluent in Spanish? lol......