Not sure what you have, but when I put a Holley 4150 on my '68 Cougar, I ended up using the ball-stud on the carb to connect it to the linkage. I simply cut the rod-end off of an old throttle cable, and used small hose clamps to attach it to the Coug's linkage. It ain't pretty, but it works.
__________________ 1992 Deep Emerald Green Mustang GT Hatch, 5 speed, 2.73s, Mac fenderwell cold air intake, '93 Cobra MAF, Mac 70mm throttle body & spacer, Explorer intakes, Mac unequal headers & offroad pipe, Magnaflow catback, Walbro 110lph fuel pump, Jet adjustable FPR, MSD Blaster coil, Accel 8mm wires, FRPP aluminum quadrant, UPR firewall adjuster, stock cable, Granatelli upper control arms.
Waiting to go on: Granatelli lower control arms, and GT40 Iron heads! | 
Accelerator linkage on a 1966 Mustang 289 V-8? 
