My 350 had a mechanical fuel pump. I don't like it because it is only working while the engine is running or cranking. I used a Holley regulator and the stock in the tank fuel pump.
And Lancem is right. You only need a couple wires. One for the distributor, one for the electric choke if your using one, one to the alternator, and one to the starter. Sensor wires and gauges are a good idea and highly encouraged. Water temp and oil pressure are the most critical.