I have just aquired a Triumph unit 650 in need of a great deal of work. The reg document says 1971 and it is J registration. The numbers are TR6P ND60474. I am told it is an ex-police bike, hence the 'P', and it is all black. I want to restore it, can anyone suggest a good publication that might help, is this a Trophy or Saint, should it have the flat ended megaphone shaped exhausts or the older torpedo type. Any advice would be appreciated