That's almost got to be a hydraulic lock situation, combined with an effort to tow-start the engine. Be sure and check that cylinder for cracks, either with dye penetrant or magnaflux- - - -the cylinder walls are usually weaker than the rods, particularly on a 261 since the rods have a heavier cross-section and a bigger wrist pin.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!