OK, so you don't want to be talked into keeping DBW. But your installing an LS1 that has electronic injectors, crank position sensor, cam position sensor, inlet air temp sensor, knock sensors, mass airflow sensor and probably an electronic transmission all controlled by an ECU but you want a cable operated throttle pedal! When for about $105 you could have one of these http://www.lokar.com/product-pgs/new...e-by-wire.html
and avoid countless headaches. Far be it from me to convince you otherwise
So I was writing when you put up your last post: If you need to have a harness made just have them include DBW, easy peasy.