rotary housing markings
 

I have a rotary out of a 1979 rx7, and my 12a was stuck when I got the car and I got the rotary's unstuck with marvel mystery oil then I pulled the engine apart, and where the rotarys were stuck there is a small amount of rust. Can I get that off and save the housing? Its not pitting the metal, just hard on the surface. Thank you
https://cimg2.ibsrv.net/gimg/www.rx7...4bd6370dad.jpg


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https://cimg7.ibsrv.net/gimg/www.rx7...26082462b4.jpg


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Take it off with a some Mmo or wd 40 and a brass wire bush.