Converters are like beer - you choose what you like and others may not agree .
I have run a Dynamic for several years as I progressed through different power levels . 9 1/2" 5000 stall . Was great won a championship with it - footbraking .
I now have a A1 Performance unit to go with my transbrake .
It is a 8" , specced to my 505 with stock port heads and 4150 carb . Was around 5500 .Fitted TF270 heads and went 4500carb stall was just over 6000 . Blew that motor , refitted 440 with big top end stall is 5800 .
This is on a pump gas street/strip motor . I always felt a little to high a stall wont hurt , to tight does .

Tex