[val1gonzales]

You can use your factory tank and run a return line. Depends on your setup. I used the Holley Sniper Stealth kit on my 66. The kit comes with a Holley fuel regulator from which I used the return line from it back to the tank. some EFI kits have a built in regulator that you have to run a line from the FI all the way back to the tank.