What stall converter do I need?

I would change the original statement to say '500 RPM above where the engine starts making TORQUE'.

We have a very close to the same combo in a '65 'Cuda, except the rear gear is 3.55 with wider tires and the heads are 63 cc chambers to make 10:1 static CR. We have a 2200 stall Hughes and at just over 1/2 to 2/3 throttle from a dead stop and and closed throttle, it will spin the tires a bit. So we are up on the torque curve there for sure at 2000-2200 RPM or so. Initial is at 11 degrees at this point. (Still dialing it in...)

I am guessing that you have the standard 340 or 360 open chamber heads? If so, your RPM of making good torque will indeed be higher than ours due to lower CR. In that case, going to a higher stall at 2500 or up would make sense. Just don't go too high if you are planning on a street driven car, or you will be spinning the TC a lot and heating up the trans and burning fuel for not good end. A lot of the recommendations for TC are for best ET's on the track....that is a different TC selection than a street cruiser.