Could be something in the pump. I once bought a 78/9 Ford LTD II, 351W that was "dead" because the NYLON TIMING SPROCKET had deteriorated, and a piece(s) of the nylon had jammed the pump, BREAKING the cam gear. In other words it broke the cam itself. Scored up the crank. I bought a "rering" kit, had the crank turned, bought a reground cam and new pump, threw it together and drove it for about 4 years.
DO NOT USE OEM nylon timing sprockets.
This car was infamously dubbed the "Skud missle" which means "according to me," a "low flying, poorly guided missile"
This is the day I hauled it to the junk yard. Did not get much for it.
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