Or just use a Portrait Cable . . .

Graphics: built-in 8-bit video, supports 512 x 384 and 640 x 480 at 8-bits or portrait monitor (640 x 870) at 4-bits (uses 64-320 KB of RAM for video, not separate VRAM)

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. . . and hook it up to the Portrait and it won't look all scrunched up. Since it's onboard video, you can run MacPortrait and orient the image in any direction you wish. Any MultiSync should run at 640x870. I run a 21" Graphics Level CRT in Portrait mode at 1024 x 768 that way . . .

. . . it didn't come with the tilt & swivel base. [}] ]'>

p.s. Change the Monitors Control Panel settings to grayscale and it should look a lot better, but still scrunched up.