Dodge Demon Gage Cluster question 1971 vs 1972

Hi,

I'm buying a 1971 Dodge Demon 340 H Code car. It has a cluster that looks like its from a 1972. Did they make only Rallye clusters 150MPH in 1971 or where they only for 340 cars? Did all 340 cars in 1971 get the Rallye cluster? What did clusters look like with vehicles built with Slant 6 engines or 318's. I'm a little mixed up as car has the 1972 grille and snorkel hood scoop. Looks maybe like VIN was put on a 1972 car or parts from 1971 put on 1971? What are your thoughts?

Thanks.