39 ford flathead 239 ci.

Where does the positive battery cable get grounded to? the head?

My 52 Merc has the ground cable going to the intake manifold. Seems to work well but I have no idea if this is original. I've heard the best results come from running a ground cable direct from the battery to one of the starter bolts.
 
There is a threaded hole in the very front of the LH cylinder head. You can barely see it in the attached picture (circled). 5/16-18 thread I believe.
 

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  • 1949 Gound Location.jpg
    1949 Gound Location.jpg
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I don't know about cars but is that not the mount for clamp that holds wiring going to generator?
 
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