I am planning to use an electric water pump on my 400/406 because they are notorious for having overheating problems. Then I'll use a BIG electric fan to pull the air through the radiator. I saw it done on the speed vision show?? The advantage to the long and short neck water pumps is it allows you to get closer to the radiator for better cooling too. The problem is you need a complets set of pullies to go with the long and short neck setup. Very confusing when you don't remember which you took off what water pump and mix them up????
Rat Rods Rule!