I've never tried 2.76 gears in an A-body, but with the limited tire size it might not be as boring as it is in a B-body. 1980s M-body cop cars used 2.94:1 gears, which worked pretty well, but they also had the A998/A999 low (2.74:1) first gear. It's a direct swap into your A904, as I recall. A 2.76 axle combined with the 2.74 low first gear would give you about the same acceleration in first gear (only) as your current transmission would with 3.23s, but with a significant difference in freeway RPM. You could further recover some of the acceleration loss with a higher-stall converter, about which I know fairly little. All of my cars have clutch pedals.