I still think that buying another carb is premature. As I said earlier, I would disconnect all the vacuum lines and cap the source for each. That will rule out all of the components that are operated with vacuum. If the stall remained maybe you should put a dwell meter on and watch and see if the ignition is failing when the stall occurs. Another idea is possibly something hanging up with the transmission or torque converter? I'm not a tranny guy but it may be worth talking to some tranny people. I'd also take some time and look the little things over, make sure you don't have a wire pinched someplace that when your braking hard things move and it causes the failure but if you brake easy things don't move? Spending money and throwing parts as a hail mary to fix things usually only irritate a person rather than solving issues.
