350 CI engine in early 70's

Did Chevy put different types of 350 motors in the Monte Carlo in the early 70's?  I was told that most had a "passenger" motor and a "sport" motor was in some but far fewer.  How can you tell the difference?  I am looking to buy a 1973-ish Monte and not sure which would be the best motor to look for.  What about the 454?  Suggestions?
 
Thanks.

I know they had an SS 454 but i don't know what year they stopped the SS, also the 454 isnt the best motor anyways, bad rod geometry