More carburation will help at higher rpm, but it will usually hurt throttle response at lower rpm. I think having everything tuned up just right would do more good than anything. There is a guy in New York who is very good at rebuilding the old Zeniths. http://www.cargurus.com/Cars/m-Larry-Isgro-Carburetors-Incorporated-sp188936

Last edited by crenwelge; 08/04/2010 6:14 AM.