Welcome, you'll grow to love the brick's. We'd like to see some pictures too.
I've wondered the same thing about fuel, from the people I've talked to the concencus seems to be at LEAST the mid-grade 89 octane or so. I run 93 in my K100, but thats only because Costco doesn't have a mid. Those tire pressures sound pretty much dead on.
In terms of maintainence, for K's it's pretty much the same for any other bike. Keep the fluids fresh, keep things clean, the usual. The only things K specific that I can think of off the top of my head are keep an eye on the shaft drive maintainence and keep the cluster dry. I also agree with tsbt, it couldn't hurt to go through and give it a general tune up including the throttle bodies.