The radio noise suppressors chokes (capacitors) are not for spark plug noise. They're for electrical noise created in the ignition coil and voltage regulators.
The regulator may not need them once they go to the solid-state style you have pictured (vs the old electro-mechanical points setup of the originals) but the ignition coil can always benefit from one.
I left all of mine in place.
The one mounted to the voltage regulator is stock. The one mounted to the fender in the Field wire is added by a PO and I had the exact same one on mine. Including two others for a total of three added to the stock ones by the PO.
The owner had been a Montana based hunting club and they had all sorts of radio equipment in it originally. Guessing that your PO, just like mine, was a radio person and wanted as much noise suppression as possible.
If they're causing trouble, or just in the way, you can probably remove them like the others have said. Just a good idea to leave them as long as possible, and certainly leave the stock ones just in case.
You may never use AM radio, but on the off chance you want to someday, you may find that your AM stations are un-listenable with the engine running.
Paul