So... is Mach GoGoGo finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 31, 1968
Manga finished: May 01, 1968
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Mach GoGoGo follows Gou Mifune, a young and ambitious racer, as he pursues his dream of becoming a professional race car driver.
He drives the Mach 5, a cutting-edge vehicle created by his father, who disapproves of Gou's racing aspirations.
Supported by his girlfriend, brother, and a mischievous monkey, Gou faces numerous challenges as he navigates the competitive world of racing.
These challenges include overcoming corrupt schemes, battling skilled rivals, and proving himself worthy of a place on the track, all while trying to achieve his ultimate goal.