What are you looking to accomplish? Our trucks do not have a fuel starvation problem. In fact, our trucks tend to run kinda rich as it is. The performance flashes typically lean out the fuel map a little at WOT. Now, if you are looking to do it for pure visual reasons, I can understand that. I think #6 would be more than enough. I ran that on the Cummins I had with a 98 GPH fuel pump and never had a starvation problem with stacked fueling modules. You can get a fuel tank fitting to 3/8" hose adapter (works with the #6 Aeroquip) from O'Reilly's Auto Parts for about $10. It will allow you to connect the Aeroquip hose to the stock fuel tank module.
-Muzzy