8 1/4 will it hold up?

In 1990, My son and I put a 450 horse 440 and a 4 speed in his 1972 Charger SE, and we put an auburn gear sure gripe with 3:55:1 gears in the 8 1/4 that was in the car. That was over half a million miles ago. It's all tired now but all that 8 1/4 has needed in all this time is 1 pinon seal. He beat the hell out of that car for the first 8 years. I think in a A body street car a 8 3/4 would be a waste of money. I'm also just wrapping up restoring my one owner 73 Charger SE. I built a 318, 397 stroker for it 2500 stall, 904 and I kept my 8 1/4.:cheers: