I can't believe I missed this post before. It looks great the difference between new and old. I got the Just SU's video from www.ztherapy.com and have been watching it, only got through 2 of the 4 hours so far, but the information is fantastic and will certainly help you get SU's running correctly.
So how is the car running now, did you notice a huge difference? I'm guessing just getting the floats right will help get the car running better.
My 240z runs ok, but now I've seen this I'm going to pull my carbs apart and inspect them properly. I have a spare set of good condition 240z carbs that I can rebuild on the bench.