well...let's see here. With a turbo datsun you can expect anywhere from 200hp with a stock turbo tuned a little to 500hp if you go all out...probably not what you're going to do. the only specs i've seen from a 3.1 stroker was 255 ft-pounds of torque and 225 hp. So...if you want over 225hp, then you're gonna want to go with a turbo. If not, all the torque produced with the stroker is a lotta fun by itself. For a turbo conversion on your 260z you're gonna need to find a whole turbo motor out of a 82-83 280zx turbo. Then you could rebuild it and put in a bigger turbo or just use it the way it is depending on how it runs. Look for one with a p90 head with solid lifters on ebay or in the forums. Then you're gonna need a borg warner t-5 tranny, a corresponding driveshaft, and an r200 rear diff. So basically, if you're gonna do a turbo conversion, you're gonna need to replace your whole drivetrain. That's pretty much it. good luck....by the way, the stroker is easier to maintain once you get it going so you might want to take that into effect.