I could be sending you in the wrong direction here so best to check if anyone else agrees with me but I think these engines were later than 1970
They were widely used in the UK by the rallycross fraternity who were looking for more power than the BDG - the Vega head, I think might have even fitted the same block
As I said treat all this with caution - may be worth posting something on the rallycroos board - if there is one - someone on there might know
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