Do you have access to a .htacces / can you create one? And do you know the feed url's? (Can you give me their format?)
A 301 redirect on a 404 page is not the way to do it 
If you answer my Q's I'll help you with the rest 
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Posts made by YannickVeys
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RE: How to Redirect all inactive Feed to a specific Wordpress pageposted in Technical SEO
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RE: Can you block backlinks from another domainposted in White Hat / Black Hat SEO
When you're running Wordpress, the best way you can "block" these sites, is to keep updating wordpress as new updates roll out. I think you mean that by: block these sites.
They're sites from hackers who hack old Wordpress sites that have known vulnerabilities. Updating your site will solve that issue, as that's one of the things that gets fixed when you update your core files.
Hope this helps.