For starters the guy you talked to, he's an idiot. The WS6 RPO designation is for the upgraded suspension. But I hate to break his heart, but the brakes, rear end (possibly different ratios, but same rear end otherwise), and trans were all still the same. The WS6 specifically states for a performance suspension upgrade, springs/shocks, that's it.
The only difference in a base and a formula is the motor, badges, and again, possibly a different gear ratio. Everything else is the same.
So yea... throw a turbo on the motor, spend a couple grand but have a paid for car with boost and pull on the unsuspecting V8 cars. 90% of most F-Body owners keep it stock or do mild bolt-ons and think its a race car, but few actually put the money into it to crank out huge numbers so you'd shock most with a boosted 3800 bird.