When I polished my internals on my 98 I just used regular oil. That seemed to work nicely. I'm sure polish will work great but don't worry if you can't find any. Oil works fine, Just make sure you clean all the metal and paint shavings real well before you lube.
As for the bolt, any rear-cocking spyder bolt with 10-32 threads will work, you'll just lose your flush cocking feature.
And about the CIP vert. adapter, buy it and try it. You can always drill the holes if it isn't high flowing enough.
" Rock and roll man, that's whats gonna change the world" - Jimi Hendrix