1966 dart commando 4 speed id

Slantsix64 said
What about the vin number? Anything in there, just in case fender tag s gone

The 5th digit of the 66 VIN will tell you it's a 273 if it is a "D" but you need the tag to find out if it was a HP-273. Like

abdywgn said
D/Dart with Holley carb?

The VIN would start out "LO" if it was.