Morse chain drive.

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Ted, here is the scanned page from the workshop
manual.   To replace the chain you have to back the adjustment
right off, remove the three centre bolts on the cam sprocket, and take off the
sprocket.   The  sprocket will only go on the camshaft in one
position as the bolts are offset.   To fit the new chain, first
position the crnak so the punch marked teeth are at 6 o'clock, and the  cam
sprocket punch marks are at 2 o'clock.  At this point No. 6 cylinder will
be in the firing position, and No 1 valves will be rocking. On the Hudson there
are 18 teeth between the punch marks, as explained earlier, Pin zero on the cam
sprocket and pin 20 on the crank.  You have to locate the chain over
the accessory and crank sprockets, and slip the cam sprocket into the chain and
lift it on to the camshaft flange.    Good luck,

Geoff.