People take such lousy photos, does it look like it has the GS emblems on the front fenders,or am I imagining it??? http://atlanta.craigslist.org/eat/cto/1468633444.html
Definitely has GS emblems on it. The GS emblem placement is a tell tale clue if they were originally there or installed after the fact. The Riviera letters and the GS emblem should be on the same line. In other words the GS shouldnt dip below the line the Riviera letters are on. That and look for the 3.42 gears. It should also have a "wide mouth" HD air cleaner assembly with the large oval hole. The base Rivs had an almost round mouth to the air cleaner.