Heater hoses

[Jasons68]

OK. 68 camaro, AC car. There are two heater hoses coming from the bulkhead between the AC suitcase and the fenderwell. Which one is the supply (coming from the waterpump) and which is the return (back to the manifold.

One of the hoses is a 5/8 the other is 3/4. trying to get this thing started! Thanks for the help.

[ZZ430]

The 3/4 goes to water pump and the 5/8 to manifold.

[Jasons68]

Thank you!!