My 84 SE GP has a deluxe interior with buckets and a console, and a 231 V6 2 bbl so definitely those years you sighted buckets and console were available. The powerplant had zero bearing on what you could order interior wise.
I also had a 78 LE GP 301 4bbl (unusual option that the car was ordered with a 4 bbl), that was loaded to the max as far as options. It also had ox blood red leather interior with buckets and a console, climate control, air ride rear suspension and a power slider sunroof. This car had options I wasn't even were available on a G body GP. The window sticker was still in the glovebox, and the options doubled the price of the base car..........