Hmmm, how do you post Videos here? Link to YouTube / Vimeo? I did not find a description here … just for pictures.
I have about 150 mi on the new engine. Probably not enough to loosen it up.
My headers are the original cast ones. And I am pretty sure, that they do not touch the starter. So it should not be a problem to get a heat shield between.
The alternator is just a couple of years old as well and has very low mileage.