Big block Valve cover suggestions?

Wondering what you guys have had luck with on your race cars. I love the looks of these proforms but they leaked almost immediately and it is getting worse. Time to try something different. Lots of companies sell similar versions of those fabbed aluminum ones but that’s a lot of $ to guess wrong again. Also wasn’t positive if they were intended for stock heads or aluminum.

Just need some that will seal up on my iron heads and have breather holes.

Thanks in advance.