looks like one of the nitro models arf's.
all my 4st engines are inverted they run well,havent had a kick back any time running them upside down,having that big head sticking out the side will look poor on a warbird.
a tip for getting the engine to line up with the center of the cowl tape a small stick of balsa to the top of the fuse, on the center line, hold engine so the hub lines up with stick mark the locations of the screw holes and make vertical lines.
fit cowl as close to the finished position as you can without screwing it to the fuse, and tape the stick to side of fuse at the center of the cowl opening,remove cowl, and line up engine hub with the stick, make horizontal lines where the lines intersect drill holes for the screws simple and easy then you can do the final tweeking,and adjusting when you fit and cut the cowl for the air inlets.
finished product, notice the head barely sticking out of the bottom of the cowl,OS 91fs