C208B PLT HAS NMAC DURING INITIAL DEP CLB FROM KONT.

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INITIAL CLB IFR FROM ONT DIRECT PDZ VOR AS CLRED AND CLBING TO 6000 FT. NO TA'S RECEIVED. AT ABOUT 3400 FT IN CLB; NOTICED A BEECH 18T IN THE 1 O'CLOCK POS HDG NNW AT ABOUT 3450-3500 FT. IMMEDIATELY BROUGHT PWR TO FLT IDLE AND APPLIED FORWARD CTL PRESSURE. ESTIMATED THAT THE BEECH CROSSED OVERHEAD BY ABOUT 50 FT. I IMMEDIATELY NOTIFIED ATC OF THE NEAR MISS AND THE BEECH 18 PLT RECOGNIZED THAT HE SAW ME AS WELL. THE CLOSEST CALL I HAVE EVER HAD AND UNDER IFR; TOO. UPON REACHING PDZ VOR; DEP CTL ADVISED TO TURN R TO JOIN V186 (WHICH IS A WBOUND AIRWAY). I ADVISED THAT MY FLT PLAN AND CLRNC WAS VIA DIRECT PDZ VOR AND THEN DIRECT TO JLI VOR (WHICH IS IN THE SEBOUND COURSE). I BELIEVE THE CTLR HAD INCORRECT INFO AS TO MY DIRECTION AND COURSE. THIS MAY HAVE BEEN A CONTRIBUTING FACTOR. OTHER CONTRIBUTING FACTORS MAY HAVE BEEN: 1) THE SUN'S POS IN MY WINDSHIELD RELATIVE TO MY DIRECTION AFFORDED POOR VISIBILITY BTWN THE 11 O'CLOCK AND 1 O'CLOCK POS. 2) THE B-18T PLT PROBABLY DID NOT SEE MY ACFT UNTIL THE LAST SECOND; BECAUSE I WAS BELOW HIM AND MOST LIKELY OBSCURED BY THE LONG NOSE; WHICH IS PART OF THE TURBINE CONVERSION. 3) OCCURRENCE HAPPENED SHORTLY AFTER CONTACT WITH DEP CTL AND I WAS NOT AWARE OF THE B-18'S PRESENCE. 4) SANTA ANA WINDS IN LCL AREA MAY HAVE CAUSED SOME CONFUSION FOR CTLR DUE TO NONSTANDARD DEP AND CLB PROCS.