My records also list six cars racing in 1967, but the Europe/America mix is different from your one.
I have two cars going to the US, one with Ford engine (the car Roger Barr raced in 1968) and one with an Alfa Romeo.
I then have Gerry Birrell racing one in British libre events with a twincam engine, and three others racing in Ireland, namely the works car driven by John Pollock and the examples of David Baird and Joe McArdle.
I have no information as to whether any of these cars were shared: just because I have names of six drivers doesn't mean there were becessarily six cars
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