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?
I am looking at ratios for the drivetrain before I pull the trigger on purchase. We have 6% grades around here for miles and I want to be in 3rd at ~60mph and 2400 rpm, but there is some leeway if the torque is flat.
The 413-1 runs really well, but as you say has 7.5-1 pistons. I did add cold air snorkel and HEI.
http://www.flxible.net/enginespecs.html:
Dodge 1971/72 V8- 413-1 4 BBL 4.188 X 3.75 7.5 to 1 265 @ 4000 445 fp @ 2400 Sodium Ex. Valves
