Torque through driveline losses

Don't know a thing about chassis dynos, but I espected (kind of) that it would give numbers that are in "tune" with the numbers taken on a engine dyno.
While I follow your equation the result doesn't make sense either, since 330ft lbs is mighty low for a 410 stroker.

The numbers given by James and jbc do not correlate at all... horsepower is a mathematical function of torque (as has been said many times), and 525ft lbs
doesn't make ANY sense. When max torque is at, say, 4500rpm, this would [mathematically] equate to 449 RWHP. ??

Scratching my head... and not trying to compete with AJ.
AJ, you're a good man!