Looks like a good sled. Those 550’s are just about bulletproof. They definetly screwed up when they went to the 580.
I’ve been pretty happy with my ZR chassis, which is just about identical to the ZL. As always I would sugest changing you chaincase oil and injection oil. Chaincase is a must, especially if it has been sitting. Injection oil isn’t a ‘must’, but I always do it to be on the safeside.
Once you get it going check to see if the speedo works. A regular service item on the Z’s is driveshaft bearings. I’ve seen originals last from 2000 to 3500 miles. A definte sign that they need to be replaced is your speedo won’t work.
Let me know if your going to do a clutch kit. Some of the off the shelf kits have a shitty engegment rpm and/or horrible secondary ramp. When you get it running post up what your engagement rpm is, and a pic of your primary clutch looking at the spring.