If it raced in the US with sports car bodywork, it probably ran as a BSR ('B' sports racing - up to 2-litre) in SCCA racing from 1978 onwards. As such, it would probably have had some odd name ('Predator', 'Gypsy', 'Mandrake' or some such guff) or been named after whoever screwed the bodywork onto it ('Bloggs Special', 'Peterson Sports' etc) so your chances of finding it referred to as a 702 in contemporary reports are slim.
I have nothing on a March 702 racing in the 2-litre Can-Am class, where single-seat BSRs would have been eligible.
Allen
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