Time to start over and punt on my block?

I talked to the machine shop this morning, and his thought was that since the head bolt hole is far enough away from the cylinder, that is would most likely be all right. He noted that a small block Chevy would be another matter where the holes are much closer. Also, he reaffirmed that hitting the water jacket was not a concern. Since the insert will seal out the water on the outer threads with Loctite, and just run sealer on the bolts as suggested here. If I am not sure, he said. I can empty out the block and have him look it over.