If the engine won't turn with the fan blades with the spark plugs removed, put the transmission in high gear and roll the truck forward a little at a time. It's very easy to mistake "overlap" between exhaust and intake for the top of the compression stroke. Since a stovebolt cam has virtually no overlap, watching the #6 valves in operation will assure you that the distributor is not timed to fire #6 instead of #1.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!