Q52
Yes - the mounting holes are the same. I am not sure about the firewall to prop hub length, but you could shim that. I also know you can reverse the exhaust and carb by turning the cylinder and piston. You should get quite a bit more power by using the Q52. If you want a LOT more power get a BME 50 or new 55x. That would take a lot more remodeling work.
Phil