Bare Engine Comprtment

I have a bare engine compartment. Nothing on the firewall, 71 Duster /6 converting to 340. It came that way so I don’t know what was where electrical wise. Can someone point me in the direction of a diagram or list of electrical components that are on the firewall? Are there any that can be easily upgraded or no longer needed? I’m also going to rewire with Ron Francis or AAW if that makes a difference. Thanks in advance.

Andrew