AN ACR LGT SPED BELOW 10000 FT.

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DEPARTING ORANGE COUNTY ARPT ON BACKBAY FMS DEP; AUTOTHROTTLES INOP. ABOUT THE TIME WE REACHED 250 KTS; WE RECEIVED A TURN TOWARD BHOSE; DIRECT WHEN ABLE AND A CLB CLRNC I BELIEVE TO 13000. I STARTED THE TURN; ENGAGED FLT LEVEL CHANGE AND SET CLB PWR; ENGAGED THE AUTOPLT. THE ACFT BEGAN A CLB AND ALL APPEARED NORMAL. ABOUT THIS TIME; WE GOT A R REVERSER ISOLATION VALVE MESSAGE WHICH DISTR ME FOR A FEW SECONDS. ON RETURN; SCAN OF FLT INSTS SHOWED A SPD OF 260. I RECHKED THE COMMAND BUG AND SAW IT AT 250; THE NOSE WAS CONTINUING TO COME UP AND I ASSUMED THE FMC WAS GOING TO HOLD THE SELECTED SPD. THE FO HAD THE QRH OUT AND WAS TELLING ME WHAT THE BOOK SAID; WHICH INITIALLY WE BOTH THOUGHT (SAID) WE MIGHT GET AN UNCOMMANDED ENG IN REVERSE. THE LAPSE IN MY ATTN TO THE AIRSPD WAS MINIMAL. WHEN I NEXT NOTICED IT WE WERE AT 290 DEGS AND ACCELERATING. I IMMEDIATELY DISENGAGED THE AUTOPLT; EASED THE NOSE UP AND REDUCED PWR; GETTING THE SPD DOWN TO 250 DEGS IN SHORT ORDER. DEP CTL CALLED ABOUT THIS TIME WITH A MAINTAIN 250 DEGS CALL. THIS WOULD NOT HAVE HAPPENED IF I HAD STRICTLY MINDED THE STORE AND LET THE FO HANDLE THE PROB. WHAT ACTUALLY HAPPENED TO CAUSE THE EXCURSION; WAS THE APPLICATION OF TOO MUCH PWR AT ONCE FOR THE FMS/AUTOPLT TO PROPERLY CTL. WITH AUTOTHROTTLES. FLT LEVEL CHANGE FEEDS IN PWR GRADUALLY. USING MANUAL THROTTLES; SETTING FULL CLB PWR AND HITTING FLT LEVEL CHANGE WAS TOO MUCH. I HAVE BEEN ON ADVANCE/AUTOMATED ACFT FOR ABOUT 12 YRS AND BASIC FLYING SKILLS HAVE DETERIORATED SOMEWHAT; AUTOTHROTTLES CAUSE YOU NOT TO KNOW BASIC PWR SETTINGS ETC. I INTEND TO DO MORE FLYING 'RAW DATA' AND MANUAL THROTTLES WHEN CONDITIONS PERMIT; IN THE HOPE I CAN KEEP FROM DOING THIS SORT OF THING IN THE FUTURE.