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I've been playing with mine for a while now.
According to the wideband O2 sensor I put in at the same time (had to debug it slightly as well - it was cheerily reporting 14.7 a lot of the time initially) I'm probably running a bit rich most of the time, but not just on any one of the 3 circuits, but over the whole range.
Idle is about 11:1 mixture when the idle bleeds are adjusted to highest idle speed as suggested, turning them down a bit get's you in the 12 - 12.5 zone, with the slight drawback that the car is a bit snorty until warmed up. Stepping on the gas drops the number down into the high 10's for a second or two, but full throttle from 1000 rpm on up to 6500 shows a pretty consistent ~12. Part throttle cruising used to suffer from a bit of bucking and snorting, but I think that was due to both manifold leaks (I had to tighten those anti-vibration rubber washered nuts a little tighter) and incorrectly set floats (level too shallow, and they didn't open nearly enough).
Since the jets all seem to uniformly be a slight bit too rich I might try getting the next biggger venturi size (34's) to fix that, I think the engine could use the bigger throats, especially when I get the new head next spring.
I still haven't gotten a nice smooth idle. Usually at idle it's mostly running on 2 or 3 cylinders. I had it running on 3 cylinders at idle, and kept tinkering with that last circuit, ensuring that the passages were clear, checking the airflow with my Unisyn. Finally swapped the carbs around in frustration, only to find that the 'weak' cylinder neither followed the carb throat or stayed with the cylinder - now I had 2 other somewhat weak cylinders at idle. I suspect air leaks at this point, I'm going to take them off again and reassemble with a slight bit of silicone sealer on the big rubber gasket. As well as ensure the throttle shafts aren't twisted, with one bore closed while the other is slightly open.
Still, all that tinkering hasn't changed the full throttle power. I should have put a stopwatch to the car before and after so I could quantify it, but I can tell there is a nice increase in power. And on top of that there's the throttle response - the power is more instant than the SU's were. They had to sort of warm up to the idea of full throttle for a second or two (I guess the pistons restrict air flow as they slowly come up - richens the mixture but delays full power?).
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