Gary Gilbertson's music is finally here, neeaat. However, I remember listening to SAP rip of this track and it was quite slower than your rip. Could it be that you've set machine to NTSC? Also this one really needs a volume modifier of ~0.5, otherwise things get clipped.
The Atari 8-bit systems have a resolution of 336x240 including overscan. Cropping the overscan area is tricky because its bounds are essentially game-specific, unlike many other systems. The Atari800 emulator, for example, has an option to crop the image to 320x200 (-vert-area short), but when not also shifting the image in a game-specific way (e.g. -vert-shift 4), can lead to graphics being cropped on one side and a part of the border remaining on the other side. So taking the pictures at a 336x224 or 336x240 resolution is a safe choice.
The screenshot is 336x225, which is why it caught my attention. (And the colours are pretty dull compared to the screenshot seen here.)
I'm perfectly fine with 336x224 or 336x240.
That other screenshot is either post-processed or uses an unrealistic external palette. The actual game uses a light gray instead of actual white for its title screen. MobyGames' picture is not from MAME, yet is very similar. Using another (accurate) emulator would give the submitter a more conventional resolution, but not a brighter/less dull picture.