ENGS ARE OVER-TORQUED AS ACFT IS CLBED IN RESPONSE TO A TCASII RA.

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DURING VECTORS TO AZO ARPT; APCH CTL ISSUED TFC 10 O'CLOCK AT 3500 FT. WE WERE DSNDING TO 4000 FT LOOKING FOR THE SMA. WE THEN LEVELED AT 4000 FT ON ABOUT A 160 DEG HDG AT APPROX 175 KTS. ATC THEN ISSUED A L TURN TO 090 DEGS. I INITIATED THE TURN AND RECEIVED A TCASII TA. I REACHED OVER AND SELECTED THE PWR MGMNT TO MCT. AT THAT TIME; TCASII ISSUED AN RA TO CLB AT 1500 FPM. I STARTED THE CLB TO COMPLY WITH THE RA. I NOTICED THE TFC WAS INDICATING 200 FT BELOW AND VERY CLOSE PROX. I THEN ADVANCED THE PWR SMOOTHLY TO MAINTAIN A SAFE AIRSPD AND ATTEMPT TO ACHIEVE THE COMMANDED 1500 FPM CLB RATE. I THEN GLANCED AT THE TORQUE GAUGES AND THEY INDICATED 120 PERCENT. IMMEDIATELY REDUCED THE TORQUE. THE TFC PASSED BELOW US AND TCASII THEN COMMANDED' MONITOR VERT SPD.' ATC CLRED US FOR A VISUAL APCH TO RWY 35. WE LANDED UNEVENTFULLY; AND RPTED THE OVER-TORQUE TO MAINT. SUPPLEMENTAL INFO FROM ACN 243681: TCASII NOW SHOWED THE TFC SUPERIMPOSED BELOW US AT MINUS 200 FT (-02). THE SINGLE ENG VFR TFC APPARENTLY FAILED TO MAINTAIN ASSIGNED OR LAST RPTED ALT. NO VISUAL CONTACT WAS EVEN ESTABLISHED WITH RPTED TFC. ACFT WAS NOT CONFIGURED FOR MAX PERFORMANCE CLB (I.E. PROP NP TO 86 PERCENT) DUE TO WORKLOAD/LACK OF TIME BTWN TA AND RA. CREW REST HAD BEEN REDUCED THE PREVIOUS NIGHT.