Turbo on those is activated via vacuum from a resevoir,there's a small bore pipe that runs from the vacuum res up over the top right side of the head,round the back to a steel pipe then rubber pipe to the turbo vac control,bolted to the engine bay bulkhead/firewall just above the top left of the head,then it runs down to the turbo/control.

possible this pipe has been pulled off,easy to do this by accident, .this will mean no turbo boost and pretty much your symptoms!

Either that or some damage was done to the crank angle sensor or sensor teeth when the clutch was fitted.but I'd be looking at the turbo boost vacuum control pipes first.