Power, not much more than a well built 2.8, torque, about 20-30 ft lbs more. However, more important is it will be spread over a much wider band. I don't know if you have already checked out the sites about the strokers. If you have, then you have an idea of what you are getting into. It is a fair amount more $$ for the increase in power/torque. A turbo yields more power per $$. But it is more complicated.
Check out
The Datsun Workshop, if you haven't already.
-Bobby