Is this vehicle fuel injected? If it's carbureted you will likely run into problems getting it to start dependably.
In the H3 remote start harness, you need to connect the red and red/black wires to constant 12 volt power. The pink wire will connect to your ignition wire, which has power with the key in the ignition and start positions. The orange wire is only used if you want accessories powered during remote start (radio, air conditioning, etc.) and gets connected to the vehicle's accessory wire. The purple wire connects to the starter wire at the ignition harness. If you want to use the built in starter kill feature, you will cut the factory starter wire at the ignition harness and connect the purple wire to the side that goes to the to vehicle. Then the green wire connects to the cut key side of the starter wire.
You need to connect the red wire in the H1 harness to constant 12 volt power. The black wire gets grounded. You will use either the green or purple door trigger wire (not both) depending on the polarity of your door triggers (probably green). The brown wire provides power to the siren if you are using it, and the white wire connects to the vehicle's parking light wire.
You will not be using much of the H2 harness. The brown/black wire can be connected to the horn wire if you want the horn to sound when the alarm is triggered. The purple/white wire connects to a tach source which can likely be found at the ignition coil. The black/white wire will be grounded. H2/13 and H2/14 will not be used in your vehicle.
Obviously the door lock harness is only needed with power locks. Other than that, make sure the toggle switch is plugged in and in the on position if you want to remote start.
These come default in manual transmission mode and will need to be programmed to automatic transmission if you have an automatic.