I am going to ask you if you're absolutely sure about the existance of the short block.
My tuner here in Long Island NY, works for a dealership and they also own a rally team. Their engines have always been V7 or V8.
He specializes in ordering JDM parts.
He told me that there were no pre-assembled short blocks from the factory, for 207. He told me that this is one of the downsides of owning a 207 swap.
Reading what I am reading in the built engine section, I tend to believe that there is nothing that compares to a factory assembled shortblock, reliabillity-wise, if you're intending to stay within the power that stock internals can handle.
So, I always thought, you're buying an ebay engine, the seller does not know what the original japanese owner did to that engine, yet you have to plunk down a sizeable amount of cash.
If something goes wrong, there is no short block to be replaced..
Now, with your info, this changes the story for me. I'm going to point my tuner to your link as well.