Non-turbo regals with the T package were made in 1987. I've heard that Buick used the "Oldsmobile" 307 cu. in. V8 motor in the Regal. Therefore, there were some T package 1987 Regals produced with this normally aspirated V8 motor. The three options that make an 87 equivalent to an 86 T-Type are the turbo motor (LC2), the T package (Y52), and the exterior sport package (W02). You had to get Y52 with LC2. The chrome 87 turbo charged regals are the ones that did not get the black out trim W02. What appears to some as a "regular regal" with a turbo motor may be these 87 models with Y52+LC2. A member in the Houston Buick club has a black 87 model with chrome bumpers and chrome trim. I think the 1,035 Limited models were the same way. You had to get the T package with the turbo motor. I also think all of these had chrome trim and you could not get W02 in a Limited.
When I purchased the WE4 there was a Buick bulletin in the glove box which described the WE4 as a "Turbo-T". I've heard WE4 owners claim that this car is the only true Turbo-T which I thought was kind of snotty.