I reckon the Shadow AVS is one of the madest looking Can Am cars. Basically a Big Block chev powered Go Kart. I think Vic Elford drove this one too in the day.
There was a field of Can Am cars as a support race to the Melbourne GP one year (There was one of the Shaddow cars in there too). I thought that race was better than the main event. The sound they made was incredible. F1 is just loud and painful but these were glorious to hear.
Cheers