W.T.F ?

Well, that CDI is kicking out an interesting spark, and Multiple sparks below 3000, and the coil if keeping up,is spraying sparks in there to beat the band. That's definitely gonna make some noise. Even more if the rotor is not phased correctly. Or if the pick-up is rubbing on the reluctor..

I would compare the hot-timing to the cold-timing and make sure the two-step is not malfunctioning. Or actually, I would just bypass it to see what happens.

Talking about spraying Multiple Sparks, I read that the MSD puts out up to 20 sparks. How many degrees would that be? All the sparking has to be done between IDK; say about ~15/18* before the tower to same after the tower, else the spark could jump to a different tower. This is more important for a D with a working advancer, but IDK, it might be worth checking, on account of the "clicking" if actually buzzing, could be pointing to the spark being a long-distance arc.
At 900 rpm, your engine is turning; 900/60= 15 revolutions per second, and requires 4 sparks per revolution, so 60 of them per second. If the MSD is blasting 20 per cylinder that would be 1200 sparks per second. That could make quite the buzzzzzzzzzz if the rotor is stretching them all out to the max. I've never has a Multi-Strike, so can't say what that might sound like, lol.
Well I did so have a MS ignition once; just long enough to get stranded on the hiway with it. Thankfully I had left the Orange box system under there, and it was a quick switch-over, and away I went.
Then I shipped that brand new no-longer-working MS straight back to the factory for warranty repair. When it came back, I put it on the shelf, where it remains to this day; a testament to the ~300bucks I wasted. But, it's in good company with all the other stuff I bought, that either failed on me, or I didn't use, or no longer use..