My experience, having bought one from a bloke in an alley in Manchester some years ago, is that there is no such thing as a cheap 308 engine. Mine was a QV and the rebuild cost (even then) eclipsed the purchase price. Which is why it's still in bits. And this one is not cheap, especially without the twin distributors and the induction tackle (I presume that if it is ex-Mondial, it was Bosch K Jetronic injection, rather than carbs?). Looks like a world of pain to me...