I have a 3 speed manual 1965 slant six valiant and I am having trouble locating the source of a coolant leak. The six drips coolant from the bottom cover of the bell housing from the bolt on the passenger side closest to the engine block. I disconnected the hoses to the heater-core to rule out a the possibility it originated from that point. The head gasket seems to be fine and the freeze plugs also seem to be okay. I was wondering if anyone knows of another reason or place I should check for the possible source of this leak?

Thanks, Rick