1920 not enough fuel

Change all the fuel hoses while at it, unless you know they are new. Use the better "fuel injection" hose. Much of the cheap "carburetor hose" gets soft from ethanol. That bit us on a cross-country trip in the 69 Dart in 1989, soon after ethanol came out. Eventually found the hose at the fuel pump suction was soft, collapsing and causing sputtering above 50 mph.