Oh ya, you will need a regulator also. I am using a return style regulator and it works fine. There are adapters you can buy to connect to the pipes at the TBI, but I didn't like that. I ran a new line from the filter to the regulator and another from the return pipe next to the filter to the regulator.
There are only two fuel lines. One is pressure from the pump and the other is for the fuel return back to the tank. Both are on the back of the TBI, so I'm not sure what the one on the front is for. Are you sure it's for fuel???
You're driving it on the street, so you would want vacuum secondaries. That will keep them closed unless you are really on it. Mechanical secondaries are for racing. They open and let more air (and fuel) through the carb when needed.