fuel tank baffles

Hi I'm just working on an LT1/Saginaw 4 speed install in my Malibu. For the fuel tank I know that you can use a Grand National or TBI Monte but they are scarce. Some time ago I gave my son our '62 Pontiac with a 400 sbc/700r4 (it was originally a Canadian car, 283/PG). The 400 was a gas hog...