When you first fired the motor,was she tight sounding? On the second and third try did it sound the same...or tighter? Why I ask ive seen
engines run for a few min. without oil,and because you PreOiled the engine it should have ran
longer. Ive seen Hydrolock in boat engines,damage
was "Bent valves&bent rods" I doubt you poured that much fuel into it. (pull dip stick and look at oil/sniff...do you smell gas?) If you smell gas
a bad fuelpump could fill the block up and "Wash the bearings"
Does the crank have any in-play now?
Here my guess.....something has come loose and has jammed the works up. Now the good ole redneck
cure would be a 6' pipe and break her loose,or throw a chain around her and pull her down the road and pop the clutch! (Yes this has worked for me on the farm)
And last question...did anyone look at the oil
Pressure when she fired up?
Ive also let rebuilt engines sit outside under a tarp for 2-3 years...no problems.

Good luck
Wick

Every Hour you spend Fishing adds
A Day to your Life!