IFR SID DEP IN VISUAL CONDITIONS RESULT IN NMAC WITH SMA APCHING THE ARPT.

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MY ACFT AN SMA WAS FILED AND CLRED FOR AN IFR FLT FROM MRY TO HWD ON SUN AFTERNOON; 11/88. THE DAY WAS PERFECTLY CLEAR WITH LIGHT WINDS--ADVERSE WX WAS NOT A FACTOR. OUR ACFT WAS RELEASED FOR DEP AND CLRED ONTO THE ACTIVE RWY EXTENSION TO HOLD (RWY 28L) AWAITING THE DEP OF AN SMA FROM THE DISPLACED THRESHOLD AHEAD. AFTER THAT ACFT DEPARTED; WE WERE TOLD THAT THERE WOULD BE AN ADDITIONAL MINUTE DELAY DUE TO INBND TFC W OF THE ARPT. AFTER A SHORT DELAY (30 SECS TO 1 MIN) WE WERE CLRED FOR TKOF. OUR SID; FOR WHICH WE WERE CLRED; SPECIFIED A CLB TO 1000' ON RWY HDG; THEN A RIGHT HAND TURN (50 DEGS) TO 330 DEGS; TO BE FOLLOWED BY RADAR VECTORS TO THE SALINAS VOR; THEN ON THE PLANNED ROUTE OF FLT. AFTER TKOF; AT APPROX 400'; THE TWR CTLR DIRECTED US TO TURN RIGHT TO 360 DEGS AND PRESUMABLY TO CONTINUE THE CLB. AS WE STARTED THE TURN; HE ASKED AN INBND ACFT (PRESUMABLY THE PREVIOUSLY NOTED TFC FOR WHICH WE WERE HELD ON THE RWY) IF HE HAD SIGHT OF THE TWIN DEPARTING THE ARPT IN A RIGHT HAND CLBING TURN. THE OTHER AIRPLANE ACKNOWLEDGED VISUAL CONTACT. THE TWR CTLR THEN DIRECTED THAT ACFT TO MAINTAIN VISUAL CONTACT WITH THAT ACFT (OURS) AND CONTINUE INBND. IMMEDIATELY FOLLOWING THAT XMISSION; WE OBSERVED A HIGH WING SINGLE ENGINE AIRPLANE IN A SLIGHT DSCNT ON A COLLISION COURSE WITH OUR ACFT. HE WAS SEEN AT ABOUT OUR 10:30 POS SLIGHTLY HIGHER (ABOUT 300') DSNDING IN A VERY SLIGHT LEFT BANK. HE WAS THEREFORE; slightly BELLY UP TO US; AND WE WERE BELLY UP TO HIM IN OUR DEP TURN. HE WAS ABOVE US DSNDING AND WE WERE BELOW HIM CLBING. WE IMMEDIATELY TRANSITIONED TO A RAPID DSCNT IN ORDER TO GENERATE SEP. THE HIGH WING ROLLED WINGS LEVEL AND CLBED AT ABOUT THE SAME MOMENT. AS THAT ACFT PASSED OVERHEAD; ITS WING FLAPS WERE OBSERVED TO BE FULLY EXTENDED (OR VERY NEARLY SO); ALLOWING HIM TO BALLOON CLB TO INCREASE VERT SEP FROM HIS VIEWPOINT. WE PASSED DIRECTLY BELOW AND VERY SLIGHTLY IN FRONT OF THE HIGH WING. OUR CLOSEST POINT OF PASSAGE WAS ESTIMATED TO BE 400-500'; NEARLY ALL OF THAT SEP WAS VERT. AFTER PASSING BELOW AND CLR OF THE OTHER ACFT; WE RE-ESTABLISHED OUR CLBING TURN AS PREVIOUSLY DIRECTED AND SWITCHED TO DEP CTL FREQ WHEN SO DIRECTED BY THE TWR CTLR. MY SURMISE IS THAT: THE TWR CTLR'S DIRECTION OF OUR ACFT IN THE MANNER DONE TOOK US OFF OF THE PUBLISHED DEP PROC AND PUT US PRECISELY ON A COLLISION COURSE WITH THIS INBND TFC. THE CONVERGING TFC WAS OBLIGATED TO AVOID OUR ACFT BY ALTERING COURSE BEHIND OUR POS; SINCE HE WAS TO OUR LEFT AND WE WERE ON HIS RIGHT. (OF COURSE BOTH ACFT WERE OBLIGATED TO AVOID THE COLLISION; THAT WAS DONE.)