Originally Posted by BudClem
... I can't seem to find access to loosen the Heat Protection plate? ...
My youngest son was reading over my shoulder, and reminded me that I have a spare heat shield for a 454 starter motor assembly (don't ask why). The image below shows him pointing to the mounting screws with which I am familiar. Unless the heat shield is in the way, you might be able leave it in place during R&R.
Unfortunately, you are on your own with the header pipe being in the way - Easy starter R&R is sometimes a consequence of header installation. You will just have to figure out what needs to be unbolted. I'm thinking, "Unbolt from exhaust manifold, and allow to droop".