The difficulty in having a pump in-tank on a car like this, is the application. Do you have a carb or fuel injection? Most pumps you can find for in-tank installation are high-pressure units for EFI, not low-pressure for carburetion. It would provide a cleaner installation, and less interior noise, but I don't really know if there is a good in-tank pump for carbureted applications. I run oldschool, with a Carter high-volume pump and Holley/Fram can filter, right behind my rear axle. I may never leave the '70s.