Just picked up a new toy/project, 1969 Fastback that is a Mach 1 clone. The guy I bought it from said he had a 351W Ford crate engine put in it, but his ex threw out all the paperwork and receipts of the work that was done. The engine was installed about 10 years ago. The heads appear to be aluminum and have SVO stenciled into them. Any ideas if there is a part number on the motor that would identify what crate it is?