Here's a web site with a lot of information, I also have I book I got on e bay, "The 99" by D.P. Murray.
http://www.savage99.com/index.php
The fact that you say it had a Monte Carlo stock has me a bit confused, 'cause as far as I can tell, they didn't have an MC stock until 1960. The "S" code puts it at a 1965 manufacture date. The 99E came with an MC stock and was first made in 1960.
Pictures would help, also barrel length, type of butt plate, magazine counter, etc!
Welcome to the wonderful world of Savage!!
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