Chapter 10 in Roger Rule's book is the most comprehensive on dates/production changes,variations, etc. After that it is pretty much a piecemeal pursuit of tidbits here and there over the years (American Rifleman had a number of articles as did Gun Digest, Shooters Bible, Shooting Times, etc.) I also have a "special edition" put out by Emap-Petersen Publications in 2000. Titled "The Complete Book of Winchester's Model 70" - it is a compilation of articles published in Guns & Ammo magazine over the years - also pick up the old catalogs off of ebay. Your serial number indicates a post-1981, post-WRA rifle (USRA), made in 1988 in New Haven CT.