[Enoch]

That is as dead on for a factory stamp as I have seen Broach marks look good. I don't know the idiosynchrosies(sp?) of the plants vin derivaties,but the Tonowanda stamp
looks good also. JMHO...Rich

I forgot to add that I have seen motors assembled the day after casting on Mid Year BB Vettes.

You should check a Julian calander for that year. It just might be that it was cast on a friday and then assembled on monday when they forgot to change the stamp...you all know how Monday mornings can be.