John_RedSox....

....get the pumper....yes there are Major advantages. You can mount
the tank and engine anyway you like, and still have constant fuel
flow to the carb....no matter which way the plane is flying, as well.

In my case....with the carb spraybar....fully 1 3/4" below the tank
centerline....I may have to fit a Cline pump/regulator to fly inverted
without the carb leaning out. No big deal....lottsa planes require
pumps....but with your pumped OS....you can just be smiling away,
as us non-pumpers are fiddling with our planes.

Dave.