I have a weber belt drive but the standard 48* babbit bearing set up but no leaks for me.
Hopefully you didn't tear up the crank seal call Dave and ask him for info. I have his cell no if you need it.

70 Duster W8 motor.
1.29 60ft 5.79 1/8 at 120 mph
glide with 1.80 gear
@3170 lbs.