Pic 2. The transfer port. Is that a massive chunk missin there? Fck! That would probably need a resleave!
But those scores are nothing. Dt would run with those. Just loose compression. Moght get away with just a hone. Easy way to tell is to take it to a specialist and they'll tell you.
Yes. The pv, exhaust studs and head studs need to be removed. No biggy.
Personally i made rhe mistake of ordering the part without letting the specialist see it. They can usually order the part for you. Which is what i'll do next. Makes it a bit easier. They can determine how far they'll need to go. No need to unnecessarily bore out more than whats needed.