Hello 68ragtop, I see that you are very knowledgeable abou 1978 trans ams. I have a 1978 trans am with a W72 as the heads have a 4 on them proving it is a W72 car. The car is currently being restored as it sat for over 20 years and the people who owned it before were not very nice to it. I am having trouble figuring out if it is a Y81 or Y82 S.E. car because it has had a new roof put on around 30 years ago and we do not have the original build sheet. Do you know if you can tell anything about it being a S.E. Car based off of the vin or cowl tags or is there somewhere else on the car I could look?