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Right in front of the passenger side head. There is a pad that sticks out on the top of the block. There will be some letter code and then your seguence number of your vin.
The numbers are stamped in not forged, so they can be kind of hard to see. I had to look twice. You need a good light. You should look straight down in front of the head and there will be a flat section of the block where the numbers are. Good luck.
I can assure you that by hand sanding the paint off the lip edge of the block, you won't hurt a thing, and just imagine, you will actually be able to see, and read the numbers!!
Even through the paint, that looks correct.
You can make out the "S" in the front of the vin,
and the "C**" denoting the horsepower combo.
Now get that paint off there so we can see
And let me give you another reason to check those numbers. When I bought my '74 vert project a few months ago, the owner said it was a nom. He was certain. (He was not the original owner). When I inspected it, and checked for numbers, it did appear as though the block had been decked because I couldn't see or feel the numbers on the front pass. side. I assumed, as he assumed, that it was a nom. Well, car was in the garage a couple of weeks, and I decided to look again for the vin number on the front block. Got a piece of fine grade steel wool and started rubbing the ledge. Well, I'll be, I found some numbers, and they match the vin. Numbers matching original motor in a car with 75,000 miles.
I also advise caution about using anything abrasive on the engine pad. If you use an abrasive material, and it leaves any marks on the engine pad, you will bring the authenticity of that engine pad into question in the future.
Use something like lacquer thinner to remove the paint from the engine pad.