Need help identifying under hood components

Hello,

Can anyone help me identify the following four items from under the hood of my 1971 Demon?

#1 is a connector from a wiring harness located near the washer reservoir

#2 is a metal clip that I found in my driveway

#3 is located on the passenger side of the firewall

#4 is located on top of the engine

Thanks for any help,
Michael Anzalone