Jim as you know I have a stepped key on my JS2 cam with the step being clock wise from the indent on the cam as you look at it in the installed position.
As ken stated, we also started with a fatter key close to the radius of the original, the rest was hand work with a file. Took a while !!!
T o get the minimum valve clash with that cam, I ended up three teeth on from standard Norton timing marks between the crank pinion and the idler and it is in fact 9 pins between idler /cam sprocket teeth.
Intake Vv at TDC has 0.174" of lift and the exhaust Vv at TDC has 0.152" of lift thats with both sets of tappets set at 0.005" when setting up
105 Intake at full lift with zero tappet.
Just an aside, I had a race meeting this last weekend, there was a mobile dyno there , so after the last race for the weekend while the bike was still very hot, pulled a quick run just to get a read out on air/fuel as I am testing the new 2 into 1 exhaust.
Also the power/torque curve as I need to see where we are at, surprised myself, as it was still making power with this system before I hit the rev limiter at 7500rpm.
I will be posting pics and details in a new thread.