OK, so I pulled my signed copy of Different's book off the shelf (forgot I had it), M14 Rifle History and Development.
His research indicates that M1As with serial numbers under 002700 were definitely made by Elmer Ballance of Devine, TX for Springfield Armory. M1As between serial numbers 002700 and 003200 were a transition between Devine TX and Geneseo, IL, but in his opinion none over 003000 were Devine guns. So it's not a Devine gun.
According to the Addenda of this book, which has a list of M1A serial numbers and production dates which Different was able to gather, serial number 008977 was produced Oct 1978 and 009334 was produced in Feb 1979. So that's a bracket of the time frame when yours was produced.
Just so you know, those early, all-USGI M1As command quite a premium in the used M1A market. With it being a National Match rifle, that commands a premium as well.
In other words, you got a STEAL on that rifle, maybe 50% off!