cam/converter selection

Many years ago a guy on Moparchat was racing a bmod type car up in north-south Dakota, he popped his good motor and was doing good in points so he put a bone stock 360 in it, it would float the valves at like 5500 so he geared it to run at maybe 5300 or so, this thing you would think wouldn’t even hang with anyone. He ended up running mid pack and was able to stay in the points hunt till he got something better built, quite a good story.
I never ran a automatic, used a old three speed in high, so I’m out of the equation on a converter for this application.