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If the distributor has been out of the truck recently, could be it wasn't reinstalled correctly. If the distributor has not been disturbed, sounds like a timing chain problem. ANOTHER ANSWER: Every time the rotor turns one complete round the crankshaft will turn twice. Knowing that, the crankshaft will pass TDC TWICE while the rotor will only point to the #1 cylinder once. If the crankshaft is at TDC and the rotor is not pointing at #1 it may just be that the rotor is pointing directly opposite. If that's the case, just turn the engine by hand, once around until it's pointing at TDC again.

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Q: Rotor is TDC but not pointing at 1 on a 1974 c20 350?
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