I have never seen a dyno sheet, but I would say about 400 ft lbs or more from 2000 to 3500 rpm would be a safe bet. Using HP/ Torque formula calculates 348 torque assuming the 265 hp and 4k rpm you posted. 440 rv engine would be similar. Both have anemic compression ratios and would greatly benefit from bumping them up. Do you need an engine?