Estate Wagon

Did Buick use two different engines in their 96 Roadmaster Station wagons?

The local used car dealer has what he claims is a 96 Roadmaster Limited wagon w/ 78k on it .He wants 8Gs -too much maybe 6 Gs . The car has a single exhaust and a throttle body. the engine sounds great I’m not positive it came with the car.
I thought that Buick went to direct injection and dual exhausts in 95
I have the same engine in my 92 Estate wagon w/ 197K and I am just looking to up grade to a lower mileage vehicle.
Did Buick use one engine for their limited wagons and another for their estate wagons ?
thanks
The engine is a 350 Chevy

yes there was the 5.7p engine theat was also used in the F body cars and corvettes (optional eng) and the 5.7 throtle body (can’t remember vin designation) that was the base eng. most where ordered with the P eng but not all.

*MY NEW* 1996 Buick Roadmaster Estate Wagon Limited