fuel line replacement

[elev8_dude]

Need some advice on replacing the fuel line in my 69. I have a 1915 with dual 34’s (I know to small) and no matter how much I pump the gas I can't flood the carbs. If the car sits for more than two to three days without a start, it’s almost impossible to start. I've had to pour gas directly in the carbs and pump about a million times to get it started. And on the road its sluggish on the throttle. I've bought rigid 3/8" lines and wanted to know the best and easiest way to replace the existing line.

Thanks for the help.