Make sure when you clearance, with parts that move, you do more than a tiny clearance.
I'd never want to leave less that .060 clearances on such violently active components as the cam....clearing from the crank or rod, or, for that matter, valve spring coil bind.....or valves to piston.
or other areas that have a potential to interfere with one another.
On the ARC flywheels, never use less than .040 clearance from flywheel outer diameter to coil legs.
This is because, ARC, with their wisdom in engineering for these components, realizes that cranks "whip" and do not run perfectly true, under higher rpm.
Thus they have made the magnet of "rare earth" which creates a very strong magnetic field, and allows the clearance from coil to flywheel to be expanded....without loss of ignition power.
In fact, under a .040 clearance, flywheel to coil legs, the coil CAN be burned out by the powerful magnetic field created by the flywheel.
Thinking that the closer the better, on flywheel outer diameter to coil legs, is an erroneous thought.
Hope this helps.
.......Paul Doss