I have a 69 Mach1 with what is supposed to be the original 351W. I have a book that decodes the casting numbers but I am having a bit of trouble with something. The engine number is C90E-6015 and the intake and exhaust manifolds also all start with C90E. My handy decoder books suggests that the 'E' on the end of these numbers specifies that this engine is for a Fairlane. Does this mean that the engine actually came from a Fairlane? or was it just originally designed for a Fairlane? The engine tag matches the build sheet but of course that tag can be bolted to a lawnmower engine; so how do I know if this is really the original engine? I apologize in advance if this has been answered before or is a really stupid question in general.
Thanks
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