Thanks a lot guys!

On a 1970 Big Block motor, is it the 5/8" hose (one closest to the front of the motor) that flows "TO" the heater core and the 1/2" hose (one mounted behind the 5/8 as you are standing at the front of the car) that flows "FROM" the heater core?

Also, anyone know why Mopar would use two different sized hoses for this setup?

Thanks again!!