compression problems

I have a nissan k11 1.0 1992

anyone had the same problem? i think it must be the head gasket. On the motorway and car stopped accelerating, made strange noise. once i turned off the engine, it wouldn't start again, doesn't get a spark, although checked there is a spark, petrol is getting to motor, and fuses are fine. It was loosing coolant from the radiator and it was dark green almost black. any opinions or experiences?

If head gasket is it worth fixing or changing motor, or upgrading?
 
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