You have two options. First is running water lines off the water pump/therostat housing or running them off the exhaust. I did the exhaust for two reasons. First in theory, the exhaust will heat up much faster than water to do what it is designed to do. Finally, its much closer, making for a cleaner look when complete. Here is a pic of what I did....

My 261 Engine....



SWEET
Sergeant At Arms: Old Dominion Stovebolt Society
BUNS?!?!?!Where we're going, we don't need no buns.....
1950 GMC 450
1951 Chevy 1/2-Ton
The GreenMachine
In the Stovebolt Gallery