I would need more info as well as others have said. Broadhopper is right on the so called "thunderbolt" ignition box. It looks very similar to the Ford EEC boxes of the 80's. If that failed you would have been SOL. It was in many mid 80's Mercruisers including my 85 Liberator. It wouldn't suprise me at all to see it cost upwards of $400.
BT
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