If making block off plates, 321 stainless is a good option because it's alloyed with titanium. 304 stainless will eventually experience chromium carbide precipitation at high temps, which can cause it to essentially rust through at exhaust temps.
https://www.azom.com/article.aspx?ArticleID=2867
https://www.aceraceparts.com/blogs/n...gt79yrxKRlbgpr
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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