The Magnum .91XL 2-stroke cycle engine seems to be the one to choose, especially with a Thunder Tiger Pro .61 carburetor and a Bisson Pitts style muffler ( the J'Tech muff won't fit within the cowl). An apc 14 x 7 prop gives more "dig" than a 6 pitch. This model is indeed one of the better flying models. When was the last time anyone could fly knife edge with no roll coupling? And on high rates, it tumbles with the best of them.
If you're into customizing, there are ways to reduce the weight by about a half pound. And the re-covering is not an easy task because it's not constructed of balsa, but some hard Chinese wood to which covering will not readily stick. However, it's still all doable.

Regards,
DrGO