Correct..
All 65-66 GT 350's had a VIN on them...
However, in 1967 groups of 289HP didn't have VIN's on them.
I don't honestly know why.
About 10-15 years ago I would come across original 67s with very good integrity without a VIN on their engine block.
After passing on my findings with SAAC it was confirmed that 30-40 cars built that same week didn't have the VIN's on their blocks either as reported by other owners.
I think Dave Mathews can confirm if your car should have a VIN with one email....
Just tell him your Shelby number...
Bret