Can you adjust the pushrod on a '83 W126 brake booster? Im pressed for time and need to narrow down so I can fix these hard brakes without bleeding them 378 times.

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If the brakes are hard, it isn't likely to be a bleeding issue. Usually if they need bled they're soft and spongey.

If you have a hard pedal, make sure your booster isn't leaking, your calipers aren't bound up/jammed in the bores, and your vacuum source is healthy. If you have a leaking diaphragm in the booster you won't be getting much boost.

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The bleeding is cause I installed a w126 booster in a w123 and the increased booster size decreases the available metal brake line, so I cannot remove the oring on the M/C without disconnecting the lines. I did a test today and It is confirmed a bad booster. Luck of the pick I guess.

Vacuum falls out after 2 seconds of braking and brakes become hard as iron without the boost. I held my foot on the brake when I shut the car down and the car... would not shut down until I released the brake pedal. I might have to use my old W123 booster if I cannot source a solid W126 one soon.

You think the M/C o ring would be okay if its only been in place for 2-3 days?

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A junkyard is not for junk