I have been looking into this swap myself due to the availability of parts, and a strong aftermarket. 200+ hp NA isn't unheard of in dirt race cars. 275-300 hp turbo with the stock ecu and 12-16 Lb of boost is the norm.
I was looking into the STD motor from Datsun Spirit but that motor costs $11,000. That is a whole heap of cash for 330-345 Hp. I can pick up a running a turbo T-bird for the price of some floor mats.
If anyone has done this swap or is planning to please post it up.