Quick engine swap questions

OK those two top bell housing bolts are pissing me off.

Are they tap into the tranny or just the motor?

How think is the tranny where they go through?

My plan is just to cut them off. I will use a die grinder or dremle. I just want to be sure if I hit the bell housing I'll be fine.

Also what size are the bolts so I can replace them.

Are they just pissing you off due to the location of them, or the fact that they are a stupid "special headed" bolt??

They are stripped