Fuel line size

You can run a large size to the carb and then neck it down to feed each side. If your carb has 3/8 inlets, I would say as long as there is no sealing issue with the next size up you would be OK. Mating it with the same size is what I might do to keep it simple. Is there is a size difference in the -6 & 3/8 even worth talking about? It's the inside of the line I forget about, the exact size that is.

Oh! 3/8 line feeds angood amount of power. What are you doing?