http://tentenths.com/forum/showthread.php?t=65024
There are references to this chassis, B31#5 in the above thread. The tub has been modified and re=enforced to accommodate the DFV, and as raced in 1976 by Raymond/Blakeney. Research so far carried out seems to indicate this tub is the original chassis 5 and later modified. It is not known if the modifications were carried out at 105 Chorley Old Road.