I hate to throw gas on the fire, but a "true" stovebolt ought to be any Chevy vehicle that has a stovebolt engine in it, sedan, pickup, big truck during all those years they were making the 6-bangers, from what the 30's to when? the 80's, 90's? But golly a lot of the 'bolters are running v8's, best not rile them up!
As far as the AD versus newer model goes, it sure is a matter of taste, but the AD and older models seems to belong to another (possibly idealized) era. I do like those well-rounded forms, yes indeed. Then also, a lot of us need to slow our hectic lives down - nothing like an older truck to force that!
Karl