i am running a large single pusher electric fan on my 429 with 12-1 compression, ive ran it in 98 degree temps for 25 to 30 minutes at a time in town and never ran hotter then 195 degrees. but ive got a good cooling system all around, with a huge B-COOL radiator, and a CSR electric water pump. its probably 25 to 30 horses gained with an electric fan and water pump, and that you can feel in the seat of your pants. but as someone stated before, it might not be the smartest route if you plan on driving your rod long distances though. i personaly am just never far enough away that i cant get my truck and trailer and retreive my car if needed.