I have this old Kwik Fli III, and am debating how to power it. I have an old OS .60 "Max" blackhead engine with the "strap on" muffler, which would look very authentic, but that probably doesn't even have as much power as a new .46 I'm guessing. I also have an OS .91 FX with a tuned pipe. This would make the finished plane weigh about 7 lbs. Would be a good combination? I'm looking for unlimited vertical here.