The magnaflow setup seems like the best design for the type of application that you are talking about. (assuming a person is still willing to use a carb for a car that is driven a lot)
The magnaflow has a return line off the pump so the fuel line to the front of the car is running at 30 psi. 30 psi is high enough that there will not be any issue with vapor lock. Then there is a small non-return style regulator near the carb that drops the pressure to 6 psi. That final length of 6 psi line should be short enough that it doesn't vapor lock. My guess is that type of setup would be able to handle most any type of fuel and weather conditions.