The $40k must be for the RUF conversion. You could probably get the swap for a lot less at a local shop. Some will install conversion kits I think, others will use engines from salvaged cars. These guys do it;
www.autosportengineering.com/3.6_conversion.htm
I don't know the price but got to believe it's less than $40K. From what I understand these motors also experience RMS leaks. Makes sense since I think the blocks are the same. Although I am guessing the crank is different for the longer stroke. Crank bore's probably the same. Can someone confirm?