Alright, a follow-up question: what would happen if I mount the engine upright, which would put the spray bar location 1.5" above the tank center line? Would this cause the engine to run lean?

The reason I ask is, this plane is designed for the mount to be installed upright. If I turn the mount sideways, then the location of the nose gear rod would no longer line up and some modification would be needed. Nothing that is not do-able, but I'd rather avoid it if it the location of the engine doesn't cause problems in the future.