Undoubtedly it is the better engine, and while they are providing the ecu and all the electrical gubbins it's still gonna be a lot of work rewiring the engine bay and so on. Then again pulling the existing engine and squeezing in the forced induction stuff and so on is also a big job really and as you say money will need to be spent.
Titsy is right though, it's gonna be more work than the LT1, although I suspect it will end up costing the same in terms of cash.
The Aurora is the better motor and it won't cost any more (probably) but it will take a lot more time and fab work.