On the surface, that particular cam you referenced is probably not a whole lot more @.050" duration than a 440/375 cam, all things considered. The difference is in the LCA being 108 rather than closer to 114, which can affect where the torque peak happens, as I understand it. PLUS affecting idle vacuum "in gear", from my observations with a 110 LCA cam in my Camaro. Which is why I suspect that you might hit or get near to your desired stall speed with the stock converter you now have.
I might add that the Chrysler 10.75" converter is the "small" converter and the 11.75" size is the normal/"large" converter. The 10.75" is what came with the 383HP engines and also in my '70 Monaco 383 "N". Reason I know that is that it takes less fluid for a filter service refill.
To me, to make those two "small" converters you now have really work, you need more cam and probably a 4.30 rear axle ratio. None of which will be very street friendly, except in competition mode. Otherwise, it'll sound like the gear and cam aren't matched very well. Plus possibly sound like the trans is slipping until the rpm gets to a particular level, when normal-driving it.
Lots of options. Your judgment call,
CBODY67