It's a bit like my brothers Turbo 2litre Pinto Escort rallycar.It's not allowed to run in the classic class due to being a non factory produced engine,but it could have been built at the time, and uses period parts.Even if it ran the 2.3 factory turbo engine it wouldn't be allowed,due to Escorts never using that engine.But throw a Rover V8 or a rotary in there and its legal.