Torque through driveline losses

Hi my 410 small block was dynoed on a chassis dyno a few years ago and produced 355 rwhp and 530ft lbs of torque. I know we loose about 25 pecent of hp through the driveline but does anyone know how much torgue we loose if any? It runs 11.4 @ 119mph in a 3000lbs car with 3.91 diff ratio with 4 speed manual!