My 1970 340 continues to run at about 210 or higher ever since I had it rebuilt. I have about 1000 miles on the motor. Radiator has been checked, new water pump, new hoses, still no luck. Could the head gaskets be on upside down or backwards?
make sure you have an 8 blade water pump, or an 8 blade hd with the anti cavitation plate , If yours is a 6 blade that could likely be the reason it runs hot.
