Still running great, in fact, it's now even better than when I first got it going. I had needed to bump up to mid-grade gas with my timing set back to 8º which I figured was due to the increase in compression with the new engine. Even so, it would still ping on hard acceleration and I felt it didn't have quite as much power as I'd expected. And fuel consumption was turning out to be about the same as I'd been getting with the old engine.
Back in October I began to notice a rattling sound from underneath at low RPM, in fact, I was on my way to play a gig at the Winchester Mystery House when I first noticed it after I got off the freeway in San Jose. Sounded like tranny or transfer case, bit I checked it out and it was actually coming from one of the Cats. I had heard this once before, a couple years previously but then it stopped and I pretty much forgot about it. I figured that the broken-up cat substrate had all blown out the exhaust by now. But this time the rattling didn't go away, and it seemed to be a little down on power. I pulled the Y-pipe and swapped in another one I had with larger aftermarket cats, and what a difference! The power is now up to where I felt it should be, and I've been able to go back to regular gas with only the slightest pinging on heavy acceleration. And the mileage has come up by 1-2 MPG on average.
So that bad cat was partly plugged and restricting the exhaust, causing several interesting symptoms.
Of course, now my heater core has gone out, just in time for winter!