Packard Hi!, The block bore is fine, just eat the liner, As for the bolts through the block, I have never seen the inside of one that has been done so like you I can only guess how they did it. The bolts only show on the oil fill side as i recall. They must drill through the stud bosses and tap the hole in the one near the cam. Someone in my area is doing it as i've seen a coupple of them. I wish i could be more help-ed
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