Hy Brian_Ostner, my first question is which "55" are we talking about 55A or 55B? My second question is, are we talking about a point type distributor or an H.E.I.? The 55B could be purchased with a V8 from the factory and a point type distributor has sufficient clearance at the firewall, an H.E.I. distributor will not clear the firewall in the 55B through 59 trucks.