After waiting about two years for someone to answer my questions about an electric to gas conversion for a Dueces Wild Conversion, I took the bull by the horns and did it myself. I cut out the fire walls and opened the front of the cowls for a pair of Magnum 25s to lay on their sides, putting the muffers on the bottom. Because of fuel restrictions I chose 25s and was able to put 6 OZ tanks in the nacelles with room to spare. I also used small sevos to drive the throttles. Again with room to spare.
How dow do the 25s perform, beautifully. The plane flys plenty fast.It loops and rolls with no hesitation. I bought the retracts for it(Robart), and I think they really smooth out the way the plane performs. Of course I had to install new firewals. I used a piece of cardboard to make a pattern. I glued everything in with Aero-Poxy for strength.
I know there are flyers out there that want huge engines in the plane. So be it. THe wait was worth it. I'm flying the plane with 10 x 6 props.