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truck engines/transmission did NOT have VIN stampings in the early '70s - there is no "F" or "HP" on the top pad .....

Friday 7*24*70 cast date
earliest possible (4 26) assembly date Monday 4/26/71

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Would a Truck engine have the model year on it ?

What he has there is a 440 that was assembled on 4/26 and as Dan states the earliest possible assembly date of that block for that stamped date would be 1971 , but there is no way of knowing if that is the case here as Chrysler didn't have the greatest inventory control back then ... at least that is what I have read on the interwebs ...

Looking at the picture of the vin pad it's not clear enough for me to say what I am thinking so I won't ...

As far as a warranty block , do you have factory/dealer paperwork that shows that this particular car had an engine block replaced under warranty ?