I have a 71 chevy chevelle ss350 with TH350 tranny and I had to rebuild the engine because the previous owner used it for drag racing. But now I have rebuilt the engine and installed a Quick Fuel 600CFM carb on it but I noticed that there was no kickdown cable on it. I have read a few things that people say you dont need it. You can use the vacuum line to the manifold instead. But then when I seen a video on Holly's website it said with the TH350 tranny you need the cable and brackets to hook it up. So I'm confused is it needed or will the vacuum line be enough? The engine has been bored .040 over I switched it to HEI ignition it also has a 1/4 cam with hydraulic lifters in it. I am new here and appreciate any advice you could assist me with. The last time I played with these old muscle cars in back in the late 70's when I owned a 68 charger 383 4spd.