I did it on my 79 T/A. I moved the rails forward on each seat. It's been awhile so Im going off memory. I believe the rails are riveted to the sliding part. Grind rivet out and drill a new hole and use red loctite on the new bolt/nut. This will gain a little over an inch and it dont cost anything. My new seat buns/foam puts me closer to the steering wheel. You can make your own brackets if your handy if you dont want to mess with the slides relocation.
I'm 6'2. I redid my seats so maybe the new foam puts me closer to the steering wheel. My knees are bent all the way so a few inches would definitely help. I've see some advertise for the first gen cars. I don't remember seeing any for the second gens. Is the floor flat enough to use the first gen brackets?
I used seat tracks from a 91 Firebird and just cut/welded the "feet" off my original tracks to fit the floorboard. The adjustment length for the 3rd Gen cars is WAY longer than the tracks in the 2nd Gen cars. I can scoot all the way forward until my knees almost touch the dash. Backwards..I can get about 4 inches from the back seat.
I also used ProCar Elite front seats. I'm 6ft @ 220lbs and I fit comfortably in the car. Way better than I did in the factory seats.