So I bought a b18b1 block bored to 81.5 for my ls vtec build. I'm building from the bottom up, everything new. As I'm cleaning the block I noticed a few marks on the back of the block and now I'm gravely concerned that it wont work. On the contact surface towards the left side of the oil filter, its chipped but doesn't meet with where the oil filter makes contact. Is this going to be a problem when I install the golden eagle kit? Also there is a threaded hole that seems to be cracked off. Not sure what went there before but will I need it. Ill try to attach a pic to show what I'm talking about.