Here is the Fbird88 method of street strip torque converter selection.
Based on 35+ years experience and looking at the engine torque-power curve.
This is for a street strip car,,, not full race.
For street strip a good target area is the blue point.
The minimum stall for good street performance with that cam is the lower Red arrow
which indiates the lower point of equal engine torque from the peak horsepower point.
You really don;t want a real stall speed less than this, unless you are a real wimp.
Full balls out race you want the stall speed right at or even a bit higher than the peak torque point.
This happens to be a dyno test graph of a 5.0L ford with the E303 cam in it....so.....