This is probably a long shot, but I'm stuck.

Has anyone put a SuperTigre G51 or any engine for that matter in a Phoenix models Extra 300?
I cant get it to fit heres why:

I'm using a Slimline Pitts style muffler and the engine mount is in the way and there is no way to fit the giant stock muffler

The directions say to mount the engine so that the front of the engine thrust washer is 4 3/4 inches from the fire wall and that still is not enough forward

The factory installed throttle tube is nowhere near the throttle arm.

Does any of this sound familiar? I would appreciate any and all suggestions/advice.

thanks, Chris