We have two 'original' GT40's running up here with our SOVREN group. One is in the pale blue livery like above without the orange accent and has been a SOVREN racer for years and years. He drives it hard but, does not put it at risk like some of the others in his run group.
The other is a black and just joined the club this year.
SOVREN is really annal retentive when it come to being 'authentic' to the time period. So these two are the genuine item's.
Neither has the "Gurney Bump".