Torque through driveline losses

James Clews said

Hi my 410 small block was dynoed on a chassis dyno a few years ago and produced 355 rwhp and 530ft lbs of torque.

Click to expand...

Those numbers don't make sense at all, sorry.
If you apply the simple math and count whatever percentage on top of your numbers, say 18% for drivetrain loss, you'll arrive at a 410 making roughly 420 horses and 625 ft lbs of torque. No way.