Old Install-69 C10

[lkt1954]

I'm in the process installing an old air hurricane 7211-F (which is their universal fit unit). I have smoothed the firewall.
In their instructions- they deal with the rear exit of the lines from the evaporator and this unit is a side vent. Not to knock Old Air, but their instruction sheets leave a little bit to be desired.
My question here is- has anyone installed this type unit in a 67-72 C10?
If so do you have any pictures you could share on installation of the evaporator and where you brought the lines through the firewall and routing to the evaporator?
Maybe I'm making this more complicated than it needs to be, but I don't want to mess up a finished firewall.

Thanks