340 Hydraulic lock inspection update...

Okay, so either compression or leak down would be done before pulling heads so should I remove plugs, try to turn over by hand, if it turns over by hand, crank starter to get as much water out as possible then spray air with my compressor into the plug holes to get as much remaining water out then do leak down first then compression test?

That is a good idea. What I'm saying is the remaining water will raise compression figures erroneously