I can reply to this one...I had a Fly-Baby with an A-80, and it did just great. The prop was a McCauley Klip-Tip, and too short for a certified airplane, but it sure spun up great on the Baby. It cruised well at 2250 RPM, and indicated 85 mph. The A-80 is just a redheaded stepchild these days though, and although the parts are like any other Continental, nobody wants to fly behind them or even work on them. If you can just get past the fact that Teledyne let the certificate go on that model, it's a great little hummer. Careful on the starts---it's got a lot more compression than the 65's you may be used to, and prone to snap back when hot. Dave K Charlotte, NC