Nice! I've got a 260Z sitting in the driveway right now. I've got two motorswaps to finish before I get a chance to rebuild it. I've got a L28, 280ZX 5 speed, and R200 rear diff ready to install. The previous owner had already swapped to the SU carbs. so I'll be using them on the L28 block. I've heard the SU carbs need to be reworked a little to fuel the L28 at higher RPMs. From the looks of the dyno run they are getting plenty of fuel to your motor. I'm guessing its an original L24?
Here is a picture of mine. Ignore the color it won't be that ugly purple for long.