I agree. That's why it's not worth doing too many modifications to your engine, no one will buy it off you one day.

Buy a car with a good engine to start with and you don't need to do an engine swap (I only have a d series because i bought it off my Dad, knew the history of the car, always garaged, not thrashed by a 50+ yr old man lol etc etc)

But yep, be patient - what makes you think someone is selling the exact car you want at the exact same time you want to buy one? Exactly.