At the moment normal unleaded not sure of the rating, but if it nocks I will use an octane booster. I think I am slightly advanced on the timing, as it spits back when cold, but will keep it where it is until I have the carb correct. I may switch to a concentric for development as I grew up with this carb and it may save me some time. I can't use it on the road to test it properly yet, I did have a very quick potter up the road, and took it upto 50 ish and it was very smooth and comfortable, too short a ride to get a proper feel though.
I have decided I don't like the sound from the 2 into 1, so have just hit Hitchcocks to go the separate pipe route, I had to order a couple of gaskets and you know what its like, you get carried away. :-)