FACEPALM!!!
He wrote about a 040 compared with a Walbro 255l/hr HP which have similar flow rates, you changed it somehow to comparing it with a 044...
Then you talk about it being half the size and not being able to flow similar because of physical size... NEWS FLASH: A 040 is also the same size of a 044, does this mean that they can only flow similar volumes?!?
Time to delete the internets, it's already filled with enough heros with bad advice
To the OP... there is nothing wrong with a Walbro GSS-342 for your predicted power. They are cheap and will flow enough, are very reliable, easy to install and are a lot less noisey than a Bosch