pixie

I've been offered a russell newbury twin cylinder diesel - it does run quite well but it is not marinised and has not been rebuilt or reconditioned. It was on a standby generator plant which I do know has has little use, so the cosmetics are more serious than the mechanicals. Having looked around at vintage engines (as I enjoy tinkering with them), I quite like these RN engines so it would be ideal as i can't afford the £15-20 K for a new one. The question is how much is it worth as I have no clue and new engine prices are not much of a guide as if its even half of that, its out of my league ! any info will be gratefully received. pix