As far as the blown head gasket, investigate the cause----many times it was an OVERHEATING issue and dependent on the severity, the head(s) may be warped and valves/ valve components could be damaged.
As far as the Hydrolock, sounds like their cylinder(s) may have excessive water in them. If the cylinder is on the "Compression Stroke", both valves are closed and the piston is coming up to compress the FUEL MIX. You can compress gases----You Cannot compress WATER (which maybe leaked in, because of the COMPROMISED Head Gasket!)----Thus, Mr. Crank cannot rotate, or attempt to start!
Pulling the Spark plugs will OPEN the "Closed Up Cylinder", and allow the piston(s) to continue to rise up.
You might do that, and be assured the engine will rotate, before committing to maybe a thrown rod etc. Even a compression test may clue you in to where the problem is.
Yes, It may be salvageable---How BAD do you want it, how much can you justify spending?
I have bought Someone's DISASTER Vehicle in the past. Had good and bad luck with them, just gotta really investigate, before you jump on the bull!
Tuesday, February 8th, 2011 AT 7:03 PM