This summer I installed an O-360 J2A heli engine in my standard wing model 5. It's equipped with SDS ignition and fuel injection. I could very well be the high HP winner! It replaced my previous O-235 because I got a deal that I couldn't refuse. Depending on who you talk to this 360 is from 25 to 40 lbs. lighter than the standard aircraft 360.
I'm still in the experimental stage and I don't feel the 72" prop I am currently using gives me maximum performance. Having said that, it is easy to get up to Vne in level flight if you don't care about fuel consumption. This does present problems during the break-in phase where you want to run the engine hard!
Performance wise I see about 1700 fpm at 80mph and take off in about 350 ft.
My empty weight is 1010 lbs.