Decifer engine & tranny serial numbers. I have a 67 dart, i think engine says 2808030 but it could.

The 5th letter is a D , so it must have been converted later to a 4bbl. Thanks for responding..
Could have been converted from 2bbl to 4bbl by previous owner. Need to confirm if it's a legit 4bbl 273 car. What's the 5th digit in the VIN? "D" is 2bbl, and "E" is 4bbl