Here are the parts you need

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I have never used a pump on a 4 - stroke, except of course my YS engines. My engine works absolutely perfect inverted the way it is and the only advantage to the pump in my opinion would be the option of moving your tank back - not a bad idea. I just think the addition of a pump would not be worth the hassles. If I was buying an engine for this plane it would be a pumped OS120 or a YS 110

If you invert the engine make sure you lower the fuel tank. I dremeled out the former as much as possible and turned the tank sideways. all in all I lowered the top about 3/4". It idles a bit rough with a full tank but smooths out in one minute or less. Yes I put the servos in the rear and the battery as far back as possible without cutting a hole in the fuse and it is still a touch nose heavy. This is an ideal engine for this plane and will give you unlimited vertical, burns very little fuel, looks better if you invert it and there is nooooo sound like a 4 - stroke. I gave up on my 2 - strokes long ago and although I dabble in gas engines I just can get used to that awful sound. I just spent $175.00 for a muffler for my Brison 2.4 in order to make the sound level "acceptable". I hate them but they are a necessary evil if you want to fly big stuff. I have a Saito 270 twin but it is only good for about a 15 lb. aerobatic plane.

Good luck.