The Car in question is a Harrier LR9 , Win Percy raced one witha YB in the back and still holds some lap records with it . The YB was run for some time before a V8 was used at LeMans .
i nearly bought chassis 1 and 2 froma guy several years ago for £2k !!
http://aolsearch.aol.co.uk/image?query=Harrier+lr9