Replace your copper lines with steel before you burn your car down. Keep the rubber lines as short as possible.
It's a common misconception that vaporlock happens between the pump and the carb. Not so. Vaporlock happens between the tank and the pump. As the fuel is being pumped from the tank it goes to a slight vacuum which lowers the boiling point. A restricted line at the tank or a plugged pickup screen aggravate this situation. A car that doesn't have a history of vaporlock usually has a problem back there. Sometimes a lost heat shield will induce vaporlock. Recent exhaust work might also if the pipes are too close to the lines.
The fuel pump will pump some vapors but not enough to run the car. The only good pouring water on the line between the pump and carb does is it gives the other lines a chance to cool enough to stop the evaporation and the pump has something to pump.
A electric pump by the tank pressurises the whole line so it's not a problem. A electric pump at the motor probably won't do much good.