Could you please explain what you mean by a 'transfer tank'? Are you suggesting an additional tank in series with the main tank?
CC member Painter sells a 17 gallon tank FOR WCC cars;
Club Cobra - aluminum fuel tank
Member Xack also has a diagram for a tank that I used to have a tank made locally.
BTW, how big is your tank? Do you still have the original tank, or has it been replaced?