I will tell you what I learned on my rod, 30 Ford coupe with a 350, 330 HP. First lesson learned you need a shroud if you don't already have one. You can buy a street rod shroud for around $90. I wanted to spend my $90 somewhere else on the car so I scrouged around and came up with a shroud off of an old Ford Maverick, I found when I turned it sideways and trimmed it a little it fit good. The fan blades need to be in the shroud opening half way and the closer the fan is to the radiator the better it will work. I also learned that sometimes a high volume water pump will work against you, especially with a small radiator, reason being the water goes through the radiator too fast , it actually goes through before the radiator can cool it down. I also learned that if you think it will run cooler with out a thermostat, it won't , you need the thermostat, even after it opens it acts like a restricter and slows down the water flow so that the radiator has a chance to cool it. Be sure that your timing is right on as this will affect cooling also. And use a 50/50 mix of water and antifreeze. More water or more antifreeze than that will also increase temp. Also a radiator cap that is not holding pressure will increase temp, every pound of pressure decreases the boiling point by a number of degrees. Sorry this was so long, hope it helps.