What does the stall test show for this converter in your car - today.

A good 440 with the production 10-3/4" converters will stall right around 2200-2800 depending on engine build and which converter.

If your converter today stalls at a real 2500 you'll gain little if anything by going to any of the suggested converters, they'll likely get you the same result you have.

If you are trying to kill low end slip then just install the production 440 11-3/4" converter - used on all the 440 engines - Sixbbl and 4 bbl.