Very nicely done, love it! I'm on my second early 260Z so I've got a soft spot for the S30 family middle child.
I do have a syncrometer, I've been tuning sidedraft Webers on-and-off for close to 15 years now. It's been some time since I've played with SUs but they're pretty simple devices comparatively. BTW, have you checked your valve lash? This is super critical to do on a fresh head. The lash can change considerably and quickly over the first few hundred miles as the valves break into their seats. I did my motor break-in while driving the car to JCCS back in 2013 and by the time I reached SLO, a cam lobe was already wiped. My best guess is that it was a result of the aggressive wipe pattern of my cam combined with a rapid reduction in lash during break-in.
I'd love to pop by Pre-Stage again some time as well, I've only been once and that was on a rainy day last December. Maybe I'll even have my side mirror repainted and fresh door cards mounted by then...