4 speed strength

A-833's can handle pretty much everything you can dish out but you have to be careful as mentioned above.
You can do a "slick shift" modification for drag racing, or use the nash-5 speed which is suggested as a beefier unit but needs mods to work in the A body with the trans tunnel and trans mount via Mopar chassis manual vol-9.

I highly suggest getting the Mopar performance Chassis volume-9, Speed secrets and performance modifications- to answer many of these types of questions for hot rodding mopars.
Part# P5007160 $30.00