Buying My First Muscle Car 1973 Duster 340 Interior Pic

Correct, H code is 340. It will be in the vin number on the dash. The fender tag will have E55 if its a 340. E44 for 318.
So, I just texted the guy "Hey, could I please get the VIN number and the number on the side of the engine?" Do you think that is all I need?