No. No, NO, no, no, no, no, NOOOOOO, No, no!
Unless you want to get penalised, then, yes!
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No. No, NO, no, no, no, no, NOOOOOO, No, no!
Unless you want to get penalised, then, yes!
If possible add unique content to your category pages, and use unique post extracts. Then no need to block.
Don't block "read more" as these link to full posts.
These appear to be tools to check if the site has been black listed for email spam. While it's good to check for when buying a domain, it won't tell you if Google has penalised the site.
Is there a site on the domain at the moment, or has there been one recently?
If there is you could see how well indexed it is (site: command), see if it ranks for it's own brand terms, and even moderately competitive terms.
You can also run the site through opensiteexplorer and see how dodgy the external link profile is.
One of the most obvious ways is to compare organic search traffic to the dates new algorithms go live. Checkout the Google Algorithm Change History page. There is even a chrome plugin called Chartelligence that overlays the algorithm change dates over your traffic data.
Also checkout webmaster tools for messages for unnatural link warnings from Googs themselves.
Hope that helps!