Here is a decent link about differing between the 2. I also have seen people say that the spotted bass's dorsal fins arecloser togetherto seem like they are one fin while the largemouth has 2 almost completely seperate fins. I really don't know but if it is a spotted bass you missed your state record by like an oz. If it is a farm pond fish then I say largemouth but if it is a big water fish then I haven't a clue but I still think it looks like a bucketmouth. (granted i have never seen an 8lb spot)
http://ozarkanglers.com/forums/index.php?showtopic=205