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Since it is in unknown condition, it's worth the sum of it's parts. What would you pay for a set of cylinder heads, etc,? If it is an SP, it'll have the small valve heads, not as valuable as medium valve heads. What's a pair of iron bore cylinders worth? You get the drift. I'd pay 500-750.. if I wanted it.
If it has the rubber elbow manifolds, it could indeed be a Convert, G5 or CX100 engine - all from 1981 likely.Edit: Though, not sure if the CX engines start with VG.