That's a 2.5 Renault turbo. It can't be an odd-fire because he's running wasted spark, and the intake manifold, throttle, water pump and crank pulley are also Z7U. He's done a much better job of what Rich J and I did with his Island kit (there's some info on DMCtalk also).
He's turned the turbos around to make it like the legend system... and now I look at it, he's done something clever with the manfolds because you can't just turn an island turbo around otherwise one will be really high up, and the other will be really low down. He's running coil packs which is the only solution if you can't work out how to mount a dizzy
I'm impressed, and yes, the engine is capable of about 260 with the right map and intercooling.
It's the same basis I've used for my turbo conversion.