Under the body/cowl on the driver side top of the frame rail. I believe its stamped on the block too . Exact location if its the original block will have to be chimed in by another enthusiast.
On the top of the left frame rail under the cowl. Original motor and frame had the same number. This has been asked and answered many times here on the HAMB. Model A Fords did not have coded Vehicle Identification Numbers. You can not tell anything about the Model A (model, color, motor size, place of manufacture etc.) from the Serial number.
It should start with a star, followed by and A, the number, and then another star. The number was stamped on the engine, at the engine plant. The engines were then shipped to the factories where the rest of the car was produced. When the engine was mated to the frame, the number was copied to the above mentioned location. Don't be surprised if it looks sloppy. Engine numbers (and ENGINE production dates): http://www.mafca.com/data_eng_production.html
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