I'm wondering what others did with this problem..Most ARF's are pretty well thought out and a tank in the wrong position would be a problem to everyone that buys the plane.
Is the plane put together so you can try to run the engine and see what happens.Would using a smaller engine put it in the rite place?I realize you want a bigger engine (I would too) but is the plane built for a certain size power plant. I had to do some fanagaling putting a 61 SF in a 40 size Cloud Dancer.I have two planes with inverted engines and they both look great but do have to be handled differently.It's a slight chore making sure you get rid of all the fuel at the end of the day that's in the head.I've bought a few extra plugs til' I learned how to get rid of all the fuel in the engine.Just my two cents...Walt