Couple + questions regarding "Knock Sensor". Does it occupy the coolant drain plug next to the starter? I have been reading and studying the issue of 305 vs 350 vs etc... and have not gotten an answer as to sensor for cu in application yes or no. Called JEGS the tech said "Uh what sensor"? I have a GM wiring diagram and "Knock Sensor" is nowhere to be found, yet I find discussions all over the place, does this "Sensor" have another name? I find no missing, cut or cut splices in the wiring loom, yes I have been through the entire wiring system (unwrapped and on the bench). I have located every "Sensor" in my GM wiring diagram and accounted for each wire color by color. Yes I may have missed it and if so what's it color and where does it come from and go to? Tried beer but only helps a little.