I beg to differ on the torque output of the 413.
The 440 and 413 are fairly close, and you have
to remember that the 413 was "pushing" more steel
and iron than the 440 back then. The 440 was made
because they needed a more tractable, larger mill
than the 413. Which in turn lowered the torque
rpm from 3400-3600 (413) to 3000-3400 (440). With
the exception of the Long-Ram Inducted 413 which
made it's torque at 2700-3000 (approx. 490-500 ft
lbs worth). I would gladly take a good core 413
any day.