The longest bolts should be about 6 1/2" (which includes the head). This is where left handed drill bits work well...
If you don't want to take it out, what were you doing when you broke it?
As for the oil leak, I would wash the area clean and then try to find the leak. You didn't leave the old o.f. gasket on and then try to use 2 gaskets did you?
C
