Intake (heat shield) and metal gaskets?

Well thanks to all for the advice on how to remove the heat shield from this cast iron intake.
Short story it worked only took about 3 minutes
But holy cow, (moo) sure I took the intake to a local u-blast shop but what I found under there was definitely not just sand blasting grit. In fact the majority of what was under there was from years of accumulation of crud and what not!
After seeing this I would highly recommend that you always remove that heat shield if you're putting an old factory intake onto a newly rebuilt or even freshened up block. What a bunch of crap under there just waiting to ruin a nice drive on a weekend.
Thanks again for the advice/help.
Rivets in last picture, in case anyone in the future wants to know what they look like.
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