Sorry, can’t help with early numbers
A couple of comments, however
•I have Barnes hillclimbing his car, with BMC engine, in 1963, before the Ford engine went in for the following year
•I also have Beckwith’s Porsche-engined 1963 Boxing Day Brands car as a Mk6
•Production figures: I have 29 Mk7 units being produced, plus 42 7S's (of which 19 had Porsche engines and 15 BMW) which makes a combined total of 71
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