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1992 Mach 1 ran good . Was -25 motor stalled fuel lines were fuel of oil . When it stalled motor locked up freed up later ?
 

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Tough to get oil into the fuel lines in any direction, but if I were to guess on how something like that could happen...

Fuel pump ruptured and oil pumped through the pulse line into the fuel. It got enough fuel/oil into the crank case to hydrolock it.

Now, I'm thinking this is either the 617 or 670 motor? Is there oil lines going down to the crank case? Typically to oil the rotary valve and crank bearing. I don't know what controls the flow, but maybe something happened there.

How it would undo itself is a puzzle.
 
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