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You should be able to date the truck by the parts assuming it has the original chassis. The engine number is nice to know but you really need to date the parts too. The engine could also have been replaced. The JS uses 60 days but your engine date could be only a few days or in some cases as long as a year (if pulled from the line for repairs) before the assembly date. Depending on where and when in the 4 or 5 year Model A production years your car was assembled will determine how soon your engine was installed. Just make a calendar table with months across the top and list major or easily dated parts on the left of the table from the JS. Color in the date ranges for each part you find on you car. If you do enough parts you will end up with a "best fit" date range of when you car was most likely assembled. The more parts you date and the more original the truck is the more accurate your date will be. You should be able to date your truck accurately between 1 to 3 months of the actual date of assembly.