833 behind a stout 440?

To the OP...a 23 spline 833 will take all that and more. What breaks gearboxes is the junk **** clutches. I've broken so many 23 spline boxes I can't count them all. My buddy had a Nova and he broke as many as I did. I even broke two Hemi boxes and I got sick of my wallet getting raped to buy parts.

Finally, I jerked my head out of my *** and listened to a local Stock Eliminator racer and spent big $$$ on my clutch. I've never broken another box since then. Not one. And I had a 2850 pound car (with my fat *** in it) with 14x32 tires and I left at 8000 without a 2 step and never broke another box and they were all 23 spline boxes. My buddy spent the same money and ran high nines with a 3400 pound car and never broke another box either.

Clutches kill parts. Get the right clutch, learn to tune it and have fun.

Of course, if you have no bite, it won't break anything anyway.