70 Still getting hot, what else to look for?

Just a wild guess. Did you have the block boiled out before you re-built? If not, you may have the same issue I had.

Remove the block drains and see if coolant runs out. The bottom of the 318 in the Demon was full of junk which decreased the amount of coolant available to flow through the system.. If you don't get a good stream of coolant out of each drain, IMO you have the same issue.