I originally had the same issue with my IO-320-E1A. Honestly, if you're willing to go down this route, is to swap out the sump for one that has the airbox intake in the midpoint. Also if it was like mine, it may be that the -A1A also has a vertical oil pickup line inside. That's another very easy thing to swap out - two bolts to take out the tube, a plug to remove to allow oil pickup through the normal in-case pickup, and a new oil pickup screen, etc.
Scott Balmos - RV-9A N112SB
Cincinnati, OH, KHAO