Temps climbing in 318

Try it on the road without the fan shroud first....just for thoroughness. The way the shroud is setting behind the rad, and with the flat, shallow nature of the shroud, it is blocking a significant amount of the total airflow at road speed. The shroud edges should be completely outside the core area, and it should be deeper and more bowl shaped, not so flat. Even with a large rad, I would not want to use that shroud.

Also, is the rad core support opening such that the rad core is completely open to incoming air, or is it partly blocked? And are there foam or rubber strips around the front of the rad core opening to the core support, to seal the air pressure and force the air through the rad core rather than allowing it to flow around the sides of the rad? I ask because I have run a larger and moderately powerful V8 (300-350 HP) with a 2 row rad core and it was fine.