I run a flex fan on my Dart with a well built homemade shroud. Keeps the 517" 700+ hp engine at 180 with no problems. Before the good shroud it was a problem in town but not on the highway.
My 72 Satellite had the water pump issue that is similar to his problem. Guessing its around 650+ hp runs 10.0. Car had a heat problem even on the highway After changing the water pump no issues at all.
