Kammala wannan jumla: Weld ya lashe gasar 1963 Knoxville Nationals, gasar farko a tseren mota. Weld ya yi tsere a cikin gasar Championship Car na USAC a cikin shekarun 1965 zuwa 1972, tare da farawa 36, ciki har da
1970 Indianapolis 500. Ya gama a cikin manyan goma sau 11, tare da mafi kyawunsa a matsayi na 4 a 1970 a Sacramento. Ya kuma kasance zakara na 1967 USAC Sprint Car Series. Shi ne direba na ƙarshe da ya tuka motar da aka yi amfani da ita ta hanyar sanannen motar Novi a Indianapolis Motor Speedway lokacin da ya yi hatsari yayin ƙoƙarin cancanta a shekarar 1966.