When Does "The Marvels Project" #3 (2009) Take Place?
"The Marvels Project" #3 "Part Three" is a historical fiction superhero comic-book written by Ed Brubaker that released October 14th, 2009. So when is "The Marvels Project" #3 set?
It takes place on the fictional Marvel Universe timeline in the year:
We know this because the Coney Island Cyclone roller coaster appears being used. This amusement park ride first opened to the public on June 26th, 1927 so it must be after June of 1927 AD.

1940 AD
We know this because the Coney Island Cyclone roller coaster appears being used. This amusement park ride first opened to the public on June 26th, 1927 so it must be after June of 1927 AD.
Furthermore, almost halfway through the issue the narrator tells us, ..."the New York docks in 1940 were a fog of corruption, mob violence, and shady characters."
More specifically, the very first textbox on the first page narrates to us, that "Summer hit New York in 1940 almost without warning." So it is presumably summer of 1940 AD.
If one accepts the concept of the sliding timescale of the Marvel Universe, the events of this story might only take place at this point from its own point-of-view and they might move forward in time relative to new stories. Galactus, a god-like character with this fictional universe says in "The Utimates" #5 v2 that 'The present moment--the "now"--hurtles from past to future along a stream of events. And events have weight. Sometimes, the weight is vast--sometimes, so light as to be undetectable. But some events--those with a peculiar, unique gravity-- are caught by the present. Dragged in its wake, like planets about a sun. Always just a handful of years behind...' As Douglas Wolk wrote in 2021, "The big Marvel story is a funhouse-mirror history".
It is a chronologically midway comic in the Marvel Comics Universe multiverse timeline and can be read at its timeline point after the previous issue, "The Marvels Project" #2 (2009) and before "Marvel Mystery Comics" #8 (1940).

