By my eyeball estimate it looks to be well over 800ft/lbs, maybe closer to 900. If you recall Matsuda's dyno, he was only making ~75kg with 722ps - his set up is very laggy. The above car with built internals and big cams is making power much faster and that should shoot the tq figure way up.
Thanks for posting this info!!! There are so many people here that are sooo enthused right now by just seeing this dyno. It gives me wood LOL. In mainland Japan there are still many Z's like this one roaming the streets.