I'm going to be turning an A/C Cuda into a non A/C car. I know they have different firewall configurations. But what is this hole for? Is it needed? I'd like to only replace the area of the firewall where the the blower motor and lines are run from a non A/C junkyard car. But if I need that hole for something, I'm thinking replacing the whole firewall would be the way to go. Anyone done this before and have any tips they can offer?
Thanks!
Sean