FLC OF A B757 OVERSHOT ASSIGNED ALT DURING DEP CLB DUE TO DISTR OF WORKLOAD AND TASKS ASSOCIATED WITH ATC CLRNC AND FREQ CHANGES.

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FO FLYING INST DEP FROM LGA VMC. LGA HAD SWITCHED DEP RWYS WHEN TAXIING OUT TO A MUCH MORE COMPLICATED DEP PAGE. LGA 8 DEP WITH 'CONEY CLB' FROM RWY 13. CREW WAS PREPARED TO DO THIS RATHER COMPLICATED PROC AT DEP END. UNEVENTFUL TKOF. INITIATED R TURN TO 175 DEGS AND SWITCHED TO DEP CTL 120.4 MHZ. SWITCHED; HIGHER ALT GIVEN; 10000 FT; THEN SWITCHED AGAIN TO SECOND DEP CTL FREQ 124.75. JUST STARTING AFTER TKOF CHKLIST; AND CHKING FOR TFC. DEP CTL AGAIN CHANGED CLRNC TO PROCEED TO COL VOR; INTERCEPT THE COL 204 DEG RADIAL TO WHITE; AS FILED. THE FO WAS HAND FLYING. JUST AFTER ACKNOWLEDGING THAT CLRNC; DEP SWITCHED US TO ZNY FREQ. AFTER TUNING THAT AND CHKING IN; BOTH PLTS WERE IMMEDIATELY MADE AWARE THE ACFT HAD GONE THROUGH THE ASSIGNED ALT OF 10000 FT; TRIGGERING AN ALT ALERT AND CAUTION. THE FO IMMEDIATELY RETURNED THE ACFT TO 10000 FT; HAVING GONE NO HIGHER THAN 10300 FT. NO TCASII ALERT; ACFT CONFLICT OR CTR CONFLICT VERBALIZED OR NOTED. I BELIEVE THIS IS A CLASSIC EXAMPLE OF TASK SATURATION AND NOT KEEPING UP WITH THE PRIMARY TASK OF FLYING THE ACFT DUE TO 'TOO MUCH' HAPPENING IN TOO SHORT A TIME. EVEN THOUGH BOTH PLTS WERE AWARE OF 10000 FT BEING THE LEVELOFF ALT (IT WAS IN THE ALT REMINDER WINDOW AND POINTED TO BY BOTH PLTS); IT IS DIFFICULT TO STAY AHEAD OF THE GAME WHEN OVERLOADED WITH CLRNCS AND FREQ CHANGES IN BUSY AIR CORRIDORS. RECOMMEND HOOKING UP THE AUTOPLT TO EASE THE WORKLOAD IN THESE SITS IN THE FUTURE!