I wish still had a petrol 6cyl in it, drove a mates and found it ridiculously smooth with a lot of torque. I recon that a 6cyl must offer similar performance to a 200tdi! If I could get a decent 6cyl I'd swop it with the current engine.
Tom
Land Rover Series 2 2a 109 Rare 6 cylinder 2.6cc engine complete | eBay
Don't know if it's any good.