MarkZ, guys...
He's using iron W2 econo heads I think.
...
You're overthinking this, don't worry. I've used Chinesium hardware store SS bolts for exhaust before. These will work just fine.
Correct, cast iron W2 race econo (long-valve).
I can't do it Mark...my OCD is holding me prisoner: the TTIs are finished in ceramic Black Satin...can't have a shiny steel/chrome bolt heads on those flanges, just can't do it man!!! LOL
(like I said, I'm a prisoner...now you know why my coupe took THAT long to hit the road)
Thanks again to everyone, great suggestions!!!