When you are looking at the engine from the front, the sending unit is in one of two places, depends on just how stock and original your 350 is. First look at the foward drivers side of the intake manifold, just above the first bolt. There might me a sending unit screwed into the intake or a threaded plug. If not, next look under the exhaust manifold in the same area, drivers side forward, it might be screwed into the head. It sould be between the #1 & #2 spark plug area. If its not there and there is a threaded plug instead, thats where to put the sending unit. Hope this helps. Let me know what you find.
