Engine is worth far more than that.
In fact if you bundled it as a conversion package could probably get nearer to 1k with gearbox.
Loads of people wanting 300 conversions and good engines are hard to find.
Hello. I have a set of Rakeway adaptors with nuts.
Thes will enable Disco 2 alloys to a 300 disco.
They cost me near £500 so make me an offer?
You can get similar from Britpart.