Luxury Lemans that’s cool beans!! My brother has 73 Grande Am also I think I’ve seen 3 in last 20 years.
I'm sure it's a rare car with the 455, a member here found out that his 73 Luxury LeMans 455 was only one of 78 built.
Sorry no breakdown of Grand Am 455 built, if it's all matching numbers probally worth alot with the 455 .
Doug in P.R.