Wow, this thread lit up since i commented this morning. After reading more, let's rule out the hydrolock issue.
I speculate a timing or compression issue based on your whirring noises. If it were a timing issue, only, you still have compression.
Troubleshoot 1. Inspect the rotor. make sure the screw hasn't fallen out, resulting in erratic mis-timing. If the screw is present, crank the motor with the cap off, and observe the rotor turning. If not. You have a broken timing belt. If it does turn, go to step 2.
Troubleshoot 2. Inspect the timing belt for correct timing. It is possible that the belt could have skipped timing by A. the tensioner is loose or has a failed bearing, B. some of the teeth stripped off a portion of the belt, leaving the belt intact, but not engaged with the crank. Observe the rotation of the rotor while cranking. See if it stops momentarily between revolutions. This would indicate stripped teeth on the belt, although there is enough to turn it. Firther inspect the timing belt by removing the outer covers. Observe the timing marks. Presuming you know the timing marks (which i will illustrate in the next paragraph), you will be able to determine if the belt is off time. You will see if the tensioner is loose. If so, realign the marks and tighten the tensioner, or replace the tensioner. If the tensioner had not failed, remove the belt and inspect for stripped teeth.
The distributor will remain in time with the cam, so if you do the timing belt alignment correctly, the distributor time will be correct.
Remove the rubber plug(if it is not missing) from the bellhousing under the pitch bar mount. Use a 22mm or 7/8" socket or offset box wrench to turn the crank untill you see 3 marks III, and line the middle mark to the arrow on top of the hole. Rotate the passenger side cam so the dot is facing up, in line with the notch on the timing cover, which also is in line with the valve cover seam 12 o'clock. This is the step where you install the passenger side belt. Otherwise, since the belt is intact, rotate the crank another 360 degrees until you get the III mark again. The passenger cam cam will be facing down 6 o'clock. From here, you will rotate the driver side cam to 12 o'clock. This is where you will install or adjust the timing belt. At this point you are done with the Timing Belt Procedure.
I would speculate that in your case, the teeth are stripped or the tensioner failed. The catching feeling you get is the passenger side cylinders between compression strokes, and there is no compression on the driver side, so you get that whee, chug chug wee chug chug sound. The cam is off enough that a valve is open on the compression stroke, by either being off time, or not moving at all.
In regard to Sea Foam, i was suggesting this to clean out oil in the intake if a hydrolock thru the pcv had occurred. Otherwise, you can apply sea-foam as a routine maintenance to clean the idle control valve and blow out carbon from the valves and pistons, ad to oil before drain, or add to fuel as a cleaner.