metal intake gaskets

So, I put on my aluminum intake with Printoseal gaskets Fel-Pro Performance Intake Manifold Gasket Sets 1213 only to find out that I didn't put enough RTV on the ends. So I just picked up some gaskets from O'Reilly yesterday instead of going to Summit. https://www.oreillyauto.com/detail/.../1972/plymouth/scamp?q=intake+manifold+gasket

And it turns out they are metal. I heard somewhere not to use the metal gaskets with an aluminum intake? Is that the case or just folklore? And do I need to put down RTV around the ports on the intake or the head side? Thanks for any help.