TA 340 6 pack in a 68 Dodge Dart vert

Do you have a fixed fan on the water pump? You could really really! Use a viscous fan on front. How old is the radiator? Is the radiator a V-8 radiator? I swapped these things out on my wife’s car along with a report shroud like you have, and it dropped the temperature, a lot!

What’s the compression ratio and where is the distributor set up? Is the cam stock?
I just put in a thermal fan clutch with the bi-metal spring. Not sure it is working. Never heard the turbine like kick in. May need to bring it in closer to the radiator by a 1/4 inch to get it at the 1 inch recommended spacing. Cam is stock from what the guy who sold me the engine said. I believe the compression is 10 to 1 for the TA 340 6pack.radiator. I just had an electronic ignition installed last year. I am not sure what the guy set it at.