Hi. I'm fairly new to planes and have a Goldberg Eagle 2 and a few questions. My dad built this plane a good seven years ago and the job of getting it flying is mine. We've bought the electronics for it, so we're good as far as servos and what not. However, here is my question. The engine is an old OS 4 stroke .65 that has been sitting for YEARS. The old beast still turns and has compression so I'm pretty sure it will fire. But facing from the frong of it (propeller nose toward you) the front right mount is broken. The engine is mounted in the plane and for that broken mount, we shimmed it off with a bunch of washers to get it to sit right and tight. My dad things it will be fine to run it as is but I disagree. What do you think? Is the engine going to break off in a spiral of death or will it work? And another one of my worries is that the engine is to big for the airframe. The plane is only rated up to a .50 in 4 stroke. (.29-.45 2 strokes, .46-.50 4 strokes)

If we should get another engine, what do you think we should go with? Reliablity, longevity, and a decent amount of power. Any advice?