73 Duster 340 engine compartment?

well the only vin on the car is on the dash by windshield and it matches title,i am thinking they took two cars and made one

That's NOT the only vin on the car, and it would be in your best intrest to verify all that to be sure what you have. You don't want to be out somewhere, or at a car show, and have the car end up stolen or something.....better to protect yourself.