Not Ranked
for all intensive purposes on a Cobra, no difference.
metalurgists will disagree, there are differences, but they won't be a factor in holding your intake down, or timing cover on, your waterpump won't fly off if you use stainless, etc.
black oxide will get surface rust more easily, but you probubly guessed that.
go with a reputable fastener company like ARP and you will be good to go
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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