Have you already relocated your charcoal canister gnsteam? Was it already eliminated, or moved to another location?
Obviously, even if we didn't know it was a '76, the location of the lower canister mounting bracket there on the firewall is a dead giveaway.
I assume there is no room above the heater control cables back in that middle area? Doug's comment about the upper plenum for accessing the ECU would be enough to move it over to it's new position on the passenger side, but how does the glovebox fit into the mix?
Paul