I’m not sure how the “cube” branding plays into the marine engine?

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“Here I have a very RARE brochure for the
Jeep 155 V6 155 HP Marine Engine

Jeep/155 the Power Cube comes in a V

INBOARD OR OUTDRIVE
MARINE ENGINE
Stern Drives manufactured by Outboard marine
Corporation (OMC), and Universal Motor Company
Inboard available from both Revley Corporation
and Universal Motor Company

Flier is printed on heavy stock (Light cardboard)
Front has a very cool “Cube Cutout”
In its folded position it measures about 8 ¾ x 6 ¼ inches. Unfolds to about 26 ¾ x 6 ¼ inches.”