Yes, they made a Q65 and it is very similar to their very popular Q75. Post some photos to help ID. I still have (2) Q75 and they were very good engines .... though heavy by modern standards. Also not quite as powerful as similar sized modern engines. They are good dependable engines though and very well made. Some of those Big Sticks tended to be a bit tail heavy so your engine might be a good choice. That engine would give the plane decent sport performance though not blistering performance at 30 Lbs. If your engine mag or electronic ignition?