[Turk]

If the block doesn't need it, why bore it .30 over from the get go? Use it the way it is, you can always bore it later.
There are other ways of getting HP out of them without boring them to ther skins.
It would also depend on what block you are planning on using.
Give George Anderson of Gessford Machine in Hastings Nebraska a call. Get the straight unbiased scoop and then decide.

TURK
Good Luck