Thanks Ace,
I have been doing lots of little bits on the bike, I redid the rear mudguard mount using a 57/58 sub frame, it wasn't rigid enough before. I have hit a minor snag with the carbs, the inlet manifolds you had are too close together to allow me to use Mikuni's. The original twin carb manifolds turn out to give clearance between the carbs, I managed to get a set of these, (from a Bercley car), but there is not enough room between the airbox and manifold to fit a carb into. Initially I will just use a single carb, and try and source a later twin carb airbox. I need the airbox to hide all the electrics and battery, and to mount the keyless ignition sensor, there isn't enough room left in the headlight.
On a side note I am looking forward to see what difference a squish band will make, I couldn't resist getting the last Hitchcocks big head, and although my Clipper doesn't suffer from detonation (Long stroke crank), I am looking forward to running without octane boosters and a bit more advance. Eventually I suspect this head will find its way to you for some tweaking, but it will be nice to contrast the 2 bullets, both with Big heads, one 535 and the other 570. I will keep you posted on developments.