1973 340 Wiring

The red one with the black plug on it is the water temp gauge wire and it goes on the sending unit on the top right front of the intake. Looks like a brass nut with a screw sticking up out of it. You have the ones on your alternator in the right place. The green ones on the alternator can go on either spade on the back of the alternator....makes no difference. Those other 2 green wires "might" be horn wires. The horn wiring usually comes around the passenger side of the motor with the alternator and temp gauge wires and then runs over to the horns on the fenderwell. Rig a test light up to them one at a time and see if the light comes on when you press the horn button.