Its fully loaded but powered by a Buick 231 V6. For its condition the asking price is not unreasonable.
That's one nicely equipped car and it is in great shape too. That v6 though... not that the 305 was *that* much better in 1985, but the car is definitely not going to be a powerhouse.
However, you're forgetting the trans isn't made to take that much more torque, so both engine and trans have to be changed.