I saw a V860 one time, mounted up side down in a midget, they said they did it to get the cg lower, I thought then, I've seen everything, but it worked great, yeh, it smoked like a radial engine on the startup, they moved the carbs to the top, oil pan, plus they said, it was easier to get the engine out, just unbolt it, and lift the frame up! Saw a lot of Ranger engines turned right side up, they ran well, when we laid down the diesel, in the Cummins diesel for Indy, I don't recall any troubles with the oil getting all upset, the oil pickup was on the bottom side, and the engine wasn't really flat, close, but not 0*, might be a good idea to think ahead, and make provisions for it, but giver a shot. Dry sump gives you a lot of options. Bob