europeans swap in the bmw v8's because ls1's are harder to find and more expensive over there.
you might want to reconsider the m6x turbo and look into an LSX swap. they are getting cheaper and cheaper. the LSX has more torque and will make more power with less than half the money into it. it will also make that hp more reliably. there is a good reason so many drift cars use them.
just food for thought.
also, the m6x swap has been covered, in detail, by many people.