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Restoring this 1954 Ford F250. Not sure if the 6 is original or not. I don't think so but I'm not 100% sure. The intake manifold is cast C3. Here are some pictures attached.
That sheds some light. Does the casting number on the block mean anything? Also, what is up with the oil line running to the top of the valve cover. It taps into by the sending unit for the oil pressure gauge. Is this how the rocker shaft was lubricated?