Sorry, don't currently have a Sky Fury. I had a Sky Fury twin once, but that "disappeared" many years ago. The K&B Allyn Sky Fury had a unique glow plug. The element had a square "notch" instead of a coil. Cute little engine with the twin stacks.

If you decide to give the OK Cub a go, make sure you break it in with a series of heat cycles for maximum performance.

Using 35 ft lines should be safe to start. Once you have flown it, you may opt for longer lines, but the shorter ones should provide better tension, etc. until you get it trimmed. The two bypass Babe Bee should really make it go.

Good luck with it.

George