Jester:
You might be able to use the following Master Monster Index to help with your quest:
http://www.sulerin.com/creatures/creatures.asp
Simply do a search for "1E 2E" having Any of these words in Source and sort by CR. That should give you some good ideas, I hope, of creatures that have been left out that you might want to include, and a rough level estimate. (Of course, you cold just multiply the CR by 1.5 and estimate from there, but it puts stuff in perspective to one another.)
Just A Thought,
Flynn
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