A LOW TIME PVT PLT OF A SUNDOWNER 23 ON A PREMATURE L BASE LEG HAS A CONFLICT WITH A KING AIR ON FINAL FOR RWY 19 AT MKC; MO.

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I CONTACTED MKC TWR FROM 10 MI NE AND RECEIVED INSTRUCTIONS TO 'ENTER L DOWNWIND RWY 19' AND ALSO 'IDENT' (WHICH I DID). I PROCEEDED WITH INSTRUCTIONS AND WHEN I WAS ON A L BASE LEG; ABOUT 1 MI OR LESS BEFORE TURNING ON FINAL APCH; I DECIDED TO RPT MY POS TO THE TWR (I BECAME A LITTLE NERVOUS; STILL NOT HAVING CLRNC TO AND FROM THE TWR BY THIS TIME). AFTER I STATED MY POS; I GOT IMMEDIATE RESPONSE FROM TWR; 'ACFT X; NEGATIVE (ABOUT TURNING FINAL); TURN N (AS I HEARD IT AT THAT TIME; LATER I LEARNED THAT IN FACT IT WAS S/R OPPOSITE!).' SENSING URGENCY IN CTLR'S VOICE (HE ALSO STATED THAT ANOTHER AIRPLANE WAS ON FINAL APCH); I IMMEDIATELY TURNED R (N) SAYING; 'ACFT X TURNING N.' IN NEXT SECOND; AS I WAS TURNING 90 DEGS TO THE R; I SAW BEECH KING AIR ON OPPOSITE COURSE ABOUT 2500 FT TO THE R AND 300 FT HIGHER. KING AIR TURNED TO THE R AND I TURNED TO THE R ALMOST AT THE SAME TIME TRYING TO AVOID COMING CLOSER TO EACH OTHER. THEN I FOLLOWED INSTRUCTIONS FROM THE TWR AND LANDED. A POTENTIALLY DANGEROUS SIT HAPPENED AS A RESULT OF MY CONFUSION AND MISUNDERSTANDING OF CTLR'S MESSAGE; ESPECIALLY WITH REGARDS TO SPACE AND TIME CONDITIONS. CTLR WAS BUSY AT THAT TIME (IT WAS ALSO THIRD AIRPLANE ON PATTERN CLOSE R TFC). PROBABLY IT WAS ANOTHER CONTRIBUTING FACTOR.