Yeah I have cracks on both of the rear bolt holes. machine shop said its not a problem as they are between two places where they can't affect anything. So I am going ahead with mine as well. using all ARP studs on mine. Found out you actually have to cut the front drivers side stud down a little as it protrudes into the water pump area causing intereferance. I email ARP and they said its no problem to cut the end off the stud a little as long as you keep it cool while cutting. I'm taking 1/2 inch off the end as it sticks way down into the block past the casting.
