1996 Honda civic starts, wont crank?

1996 Honda civic starts, wont crank?
Added (1). My 1996 civic starts but the engine wont crank. I replace the coil in the distributor, replaced every spark plug, and the cables. Sometimes it cranks up regularly, other times it hesitates for minutes before finally cranking. As I turn the key over the motor will jump as it is trying to crank. I do believe I have a blown head gasket if that may be a problem. Car drives fine other than that

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