Will a mechanical fuel pump work?

ok, so here's the deal. i have a fuel safe sportsman tank on my '66 coupe, and the fuel pickup comes out of the front side of the tank. I just got my new Pro Cell for my '65 convertible but the pickup is on the top of the tank. Will a stock mechanical fuel pump be able to suck the gas out the top of the tank? Or will i need to convert to an electric pump?