You misunderstand what the engine is, it's not a yeehaw cowboy rebuild with +0.25s here there and everywhere.

You also clearly don't realise the money/time/labour that goes into a proper competition motor.

If there is more than £5k profit in that engine I'd be surprised, sounds a lot but its less than a 10% margin. Ford make about 50% on replacement engines, sometimes more.

I mean no offence btw. 61k for a rebuilt YB for a saph yeah it's cuckoo but 61k for that, off the shelf, ready to go, ain't too bad