How many using an A500 overdrive ?

What kind of HP can I expect to reliably put through an A500/42RH with a performance rebuild kit and not swapping HD components? Thinking around 400 but I would think torque plays into this as well.
Can anyone recommend a good kit to go with? I currently have a good working 1995 42RH out of a 5.2 2WD RAM with 140K on it. Will most likely upgrade the converter to around 3000 stall.