I think that's round about when they changed the shape of the engine casings. From memory, the new design had triumph cast into the metal. If your engine casing hasn't got that, it's probably the older version. The newer GB Racing cover will not fit on properly if so - it'll seem to fit but fail to go all the way on, and therefore the bolts won't tighten (or you crack the cover!)
The only V8 I'm likely to own comes in one litre tetrapaks and tastes like celery.