About the only thing I have ever found consistent an an FE block so far as number go is every one that i have owned from my 332 PI to the 427 TP had a 352 on them. The engine in my 69 Cobra also has that 352 and I never did know what it meant unless it was just a series stamp meaning FE series or something.
If the heads came with the engine, inside the valve covers and about the center of the heads they will have the same date code stamped there.
Ron
