Brian,
The #10 bike was has been modified in the steering head, i think John said it was done by Rob North. The reed valve was cast up by some guy overthere and the same guy ported the cylinder with an extra two transfers, John said that PFR pipe was the best one he has used. Most of the 400s had reed valves and 6 speed gear boxes. He rode in the 60+ and was quick ;)
Funnily enough i have the exact same setup on my 400 ;D ;D