1967 Imperial heater hoses help

Hi.
I hope somebody can help me, as the majority of photos on the web don't really show the details clearly.
I own a 67 Imperial convertible with a/c.
I need to install new heater hoses, but I have noticed that on the firewall there are two sets of inlet and outlet ports. Two are vertical and approximately 6" further right two are horizontal.
Does anybody have a simplified fitting diagram, even hand drawn showing the correct routing?
Are the other ports important?
Many thanks in advance
Alan...

1967 Imperial heater hoses help
Author: Alan Hirons