The good news here is, is that someone up here will install the 3.8l kit. I'd love to see what your impressions are regardless of where you have it installed.
I was talking to a P-car buddy this week who's a former NSX owner. He looked at that kit and was remarkably impressed. A similar build on a Porsche would cost over twice as much and not offer the same performance gain. I will look at one of the SOS builds when my engine climbs over 100,000 km as a refresh for the car.
That said, ship it (the engine) or drive the car down. It's worth it. I did that a similar build with JG Engine dynamics on a Prelude I used to own. I shipped them the motor, it came back, we installed it and everything worked perfectly. That's good piece of mind.