On our Mopar 904s in our bracket cars, I believe
the plantaries are smaller (?). I run adapters and
mild 500 inch (650HP) motors and often go hundreds
of runs before damaging them.
When they have broken it is not a big deal as I know right
away before the 60 ft. mark (They have never broken anywhere
else om the track).
Of course, the aftermarket straight cut gears take less HP and ARE
faster/stronger. Also, we play with the ratios regularly. But we spend thousands
on them and they are reserved for our Superstock and Stock Race Cars.