Can't mess with money... stroker bbk is an expensive ordeal (trust me, I know!

) done right. Hard to find performance parts inexpensive
The spot on the case that "you're really worried about" is the one you should be worried about. That is a pretty gnarly gash straight into the crankcase. I believe, not treated properly, that could easily become an airleak and necessitate splitting the cases again to solve.
The other two are located inside of the motor mount cavity and not against anything crucial (there's another layer in there before you get to anything important). Very common to see where someone didn't do it correctly and pried the cases apart with a screwdriver or the like 8-| not good obviously but not show stoppers!