My advice would be keep it, I sold my old 870C last year and regret it massively. If I was in your shoes I would restore it with your lad who will I'm sure will enjoy helping you fix it up and learn how they work.
Your car will be worth more even in a few years if it's restored.
I would then buy a cheep buggy or something for bashing then you won't destroy a pice of history.
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