HEY Condor you might want to go for the one without the electronic ignition. The one with the magnito would be a easier fit. The only thing that I can see different from the original Quadra is the muffler on the new one is on the side and the old ones are on the rear exhaust. You do not want to turn the 4 blade prop more then 3000 to 3200 rpm which will fly the plane great. anything over that the blades will just flatten out and you will loose power. Mine with the Quadra 40 and the g-38 module is turning around 3000 and it flys like a P-51. To much power on that reduction unit might start to vibrate it apart. I rember an article on some guys putting a Quadra 50 on the reduction unit and it blew it apart, the shaft could not handle the extra power, they had to make some modifications to the unit.

bob