no way!
i sure as hell wouldnt pay that much........might be worth it, buti wont pay it haha.
id say 200-250 for the interior, it is after all some seats, are you getting trim with it too.
And the engine, well......unless he has other buyers, you offer is its value, so its either zilch for him or whatever you offer, i wouldnt like to pay more than 500 quid for an engine.