Good guess!.....Close
You don't know how many times I hear, Nice Chevelle!
It is a 72 Buick Gran Sport, the last year it was made.
There are very very few differences between the two (71 and 72). I think the fact that I removed the bumperettes off the front bumper makes it harder to differentiate since 71 didn't have them as an option.
The only differences I know of are the hood grills (nostrils) on the 71 have chrome accents where as the 72 is just all ABS plastic. The 71 also has a different paint scheme for the grill with more silver in it to go along with the hood grills.
And if you want to get picky, the rear tail lights on the 71 has 6 screws where as the the 72 has 4.
Also the big one that most ppl get is the front bumper on the 71, though identical to the 72, does not have a rubber bump strip on it, it's just all chrome. If you look closely you can see the mounting holes for mine. I'm too cheap right now to drop 100 dollars for a replica half inch piece of rubber that is 6 feet long. (I'll get it some day)..... NOS is over $400.
Thanks for the interest, I love this car, I get so much joy from working on it and cruising in it.
The A-Body Le'Mans of this year is almost identical to my GS... The only things that were changed were the bumpers and the hood/grill.
You should post up a picture, I'd like to see it.