I went to Mallory Park for a testing day for the first time in 20 years in Sept along with Jackie Stewarts 1969 WDC winning Matra a Maserati 250 F and Barry 'Whizzo' Williams in a classic Ford Zephyer was this hot 500 which sounded like it had a turbo attached. Does any one recognise it ?

Thanking you in anticipation

Cheers