or just swap the engine,..there are plenty about in breakers yards.,compression testing is easy and cheap and can be done with the haed on,pressure checking for cracks can only be done with the head off the car.these are two different ways of checking the for compression/pressure.you could take your head off and get it pressure checked at it comes back ok ,..only to find out your bottom end/piston is cracked hence getting a compression test done first.
big al