I do not believe that click was an accurate word for the noise. It is more of a squeak, happens in 1-2 second intervals. Also, there are no visible arcs near the HV splitter. I am assuming the problem is somewhere after the first big cap because the noise continues after the unit is unplugged.
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Being the front of the motor may make this suggestion a bit silly....
I have heard of this sort of problem before and it turned out to be air sucked through the throttle butterfly plate bushing. Happens only when certain vacuum is present and the throttle plate is in a particular position,revs at a certain point etc. Check for wear in the bushing. They can be re bushed, or get another carby for it. Check also that you dont have any intake manifold leaks. Use carby cleaner about the manifold,quick spray and the revs change means that you have an air leak, could cause a whistle/squeak noise also.
Hard to find these sots of things. I could suggest having a fiddle with the throttle shaft when the noise occurs, to see if you can isolate it better.
Seeing that it comes from the front of the motor, check all your exhaust for good seal also. With a bit of back pressure, it may be a leaky exhaust up front.
Bit of a worry that it keeps chopping up bearings. What oil mix are you using? I doubt that it is engine internals. Unless something is very wrong. May also be a water pump if my other suggestions wrong. If it relates just to revs, then sounds like a bearing... maybe waterpump. If it stops when you roll the throttle off keeping the same revs, i reckon intake or exhaust leak.
Let me know what you find. Cheers