What car are we talking about? My 68 uses a throttle rod and they make a Mr. Gasket kit the fits right in the the big round opening on the linkage and use hook up to that then adjust the rod. If using a cable, got to a parts store that carries Edelbrock products anf the should have all the adapters you need. I ahve put one setup for with Ford linkage on a Buick before, worked great.
68 RS, Ash Gold,pwr brakes,pwr windows,Hounds tooth,355/T350,MSD 6AL,3200 stall Dynamic converter,3.31:1 posi,Autometer guage pod