Engines looking good again! The twin su carbs do look great in there.
I must be honest, knowing the person who rebuilt the gearbox for you and the meticulous work he does, i highly doubt that gearset would've been used, as he takes real pride in his work. I know when he rebuilt your gearbox for you, a lot of the gears needed replacement, as they were damaged quite badly, so doesn't make sense why he would replace with still poor ones.
Unfortunately, the hard evidence speaks for itself here, but I appreciate you might have a different opinion.