There is no situation I can think of that an LT1, for instance, wouldn't be a better crate? Why subject yourself to the huge OHC cylinder head if you're already fighting every other part of the swap? And you get DI if you use the new Chevy crates. Also and I know this isn't an NA solution, but it appears based on dimensions the LSA would fit under the hood of our cars...heh
If you must DOHC I think Ford sells a better crate for the money
But somebody should totally develop a bolt-in mercury marine swap kit for these cars and sell it for the price of a Dinan stroker, it'd probably still be cheaper on black friday
EDIT: Ok, Chevy Performance's website is extremely irritating. LS9's are seriously cheaper complete than an S65. What in the world