I like a zinc-rich primer, especially for the aluminum parts. Gotta clean everything & use a wax & grease remover, of course. Max Wedges got the brownish shade of "Hemi Orange", also known as Race Hemi Orange. I think I used the VHT brand on mine but that was a few years ago. Seems every rattle-can brand is a different shade: some yellowish, some reddish.
Everything should be about room temp, so hopefully you're good there.
I've painted my aluminum heads & intakes to match the block for 40 years, and haven't had one peel or flake yet.