Castle Gates still exists but consists mainly of businesses, rather than private dwellings - an Estate Agent, Norman R Lloyd, Brady's Irish Bar, The Lucroft Hotel, Vincent's Taxi's, DJB Hairdressers to name but a few!
I live in Shrewsbury, and would have gladly taken some photos for you but unfortunately the digi camera was broken by one of the kids over Christmas.......can't afford another one yet!!
I'm not sure what is now at number 64, or indeed if it still exists. A lot of the properties just have names not numbers.
I would suggest that you contact the Shropshire Archives. They are very helpful, and in fact helped another Rootschatter recently with an old map of Castle Foregate. I believe they charge about £3.50 for a copy of a map.
Here's the link to the site:
http://www.shropshireonline.gov.uk/archives.nsfIf you email them, they usually reply very quickly.
Good Luck!
Jan