65 Cuda V8 #s...another question.

You'll have to get the block casting number to be sure if it's a 273. The date code will give you the approximate year. The VIN is not stamped into the engine so there is really no way to tell if it's original to the car. The block casting number is right above the starter and the date code is cast into the block on the passenger side just to the rear of the motor mount.