Tim,
I fitted the setup recommended by Roger King, and this has worked well, better on part throttle opening, better progression and a better response to flooring the throttle. It's probably lost a little at the top end compared to the old setup, but that was the only place the old setup was any good!
Choke = 38mm
Main = 155
Air = 170
Slow Running = 60F8
Pump = 35 or 40 (I went for the 35)
Float = 12-13mm, 8mm closed.
Are you going to the West Hants meet tonight?
Rgds
Ian