The Supre Tiger .60 is much more than needed, and the detrimental effects from such a large "shaking" engine, weight, balance, strength, and trim, may cause a lot more problems than one would want.
Back when Dick and Bart were flying the Electras, the first engines used were McCoy .35 RH's. Later, when they became available, they switched to the McCoy .40 RH's. With either engine, the prop of choice was the Grish 9x6 black 3 blade.
When I built my first one, I powered it with an OS .35S, with the same Grish 3 blade. It was a delightful flying plane, never giving me the feeling of being underpowered.
My second one was powered with a nice McCoy .40 I finally was able to get, (from T&L) again with the same Grish prop. The plane, though a bit heavier, still flew without effort, but also seemed to have more power in the manuevers.
Todays modern engines suited for stunt, I'd hesitate going larger than an LA .46.