YOu need to run the timing cover too. There is on bolt hole difference between the old and new style covers. I think the newer block has the hole and the older cover doesn't, been a few years since I did this so double check when fitting up the cover. If that hole is there and is not plugged it will leak coolant, BTDT.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.