David S - it's only ever original once. After that, in my view, you paint it so that it's most durable and useable. My position would be to leave the coil mounting bracket un-painted since it's already plated, and I'd leave the coil in it's black original finish since it won't rust anyway. Having both the coil and bracket this way allows you to mount or remove the coil without damaging the finish - which is nearly impossible if either are painted.
Ooh, and I almost forgot. I see you were attempting to mount a tiller gearbox bracket to your rearend with a PTO output. Your pic shows the tiller bracket upside down. Just turn it over and I think it will fit - but you won't be able to mount the gearbox.
Michael S - concerning you painting your Original, if you do end up using rattle cans I would suggest using either white primer or after you prime use a flat white base before painting the IH Cub Cadet Yellow or the Case/IH Iron Guard Federal Yellow. You'll find the yellow covers much quicker/easier over the white. Otherwise, as Brian A. noted, you'll find the yellow doesn't cover well.
Digger (or Charlie) - you posted that pic of all the engines in the Louisville factory. I've seen a few other pics, one showing the guy actually doing the painting - which looks more like he's in a shower of paint.
In the last pic you posted you can see the coil wire isn't painted. That wire would be an easy addition when they were done painting, but I'm wondering about the S/G belt. In the pic you can only see the S/G belt on one engine (rotated different direction than all the others), and it almost looks like the belt is painted but doubt it is. Does anyone know for sure? Did the factory actually paint the S/G belt? If not, how did they install it without messing up the paint on the adjustment bracket?